How does methamphetamine (aka. crystal meth) affect the brain?How does methamphetamine (aka. crystal meth) affect the brain?

To answer that question, I’ll need to explain a part of the brain called the Limbic System.

Within the brain there is a set of structures called the limbic system. There are several important structures within the limbic system: the amygdala, hippocampus, thalamus, hypothalamus, basal ganglia, and cingulate gyrus. The limbic system is among the oldest parts of the brain in evolutionary terms. It’s not just found in humans and other mammals, but also fish, amphibians, and reptiles.

The limbic system is the part of the brain involved in our behavioural and emotional responses, especially when it comes to behaviours we need for survival: feeding, reproduction and caring for our young, and fight or flight responses (https://qbi.uq.edu.au/brain/brain-anatomy/limbic-system).

The limbic system contains the brain’s reward circuit or pathway. The reward circuit links together several brain structures that control and regulate our ability to feel pleasure (or “reward”). The sensation of pleasure or reward motivates us to repeat behaviours. When the reward circuit is activated, each individual neuron (nerve cell) in the circuit relays electrical and chemical signals.

In a healthy world without addictive manufactured drugs, humans survive and thrive when they are rewarded for certain behaviours (cleaning, hard work, sex, eating, achieving goals etc), hence evolution has provided us with this feel-good chemical so that we will repeat pleasurable behaviours.

There is a gap between neurons called the synapse. Neurons communicate with each other by sending an electro-chemical signal from one neuron (pre-synaptic neuron) to the next (post-synaptic neuron). In the reward circuit, neurons release several neurotransmitters (chemical messengers). One of these is called dopamine. Released dopamine molecules travel across the synapse and link up with proteins called dopamine receptors on the surface of the post-synaptic neuron (the receiving nerve cell). When the dopamine binds to the dopamine receptor, it causes proteins attached to the interior part of the post-synaptic neuron to carry the signal onward within the cell. Some dopamine will re-enter the pre-synaptic nerve cell via dopamine transporters, and it can be re-released.

When a reward is encountered, the pre-synaptic nerve cell (neuron) releases a large amount of dopamine in a rapid burst. Dopamine transporters will remove “excessive” amounts of dopamine naturally within the limbic system. Dopamine surges like this help the brain to learn and adapt to a complex social and physical world.

Drugs like methamphetamine (a stimulant drug) are able to “hijack” this process contributing to behaviours which can be considered unnatural or potentially dysfunctional. A range of consequences can follow.

When someone uses methamphetamine, the drug quickly enters the brain, depending on how the drug is administered. Nevertheless, meth or ice is quick acting. Meth blocks the re-entry of dopamine back into the pre-synaptic neuron – which is not what happens naturally. This is also what cocaine does to the brain. However, unlike cocaine, higher doses of meth increase the release of dopamine from the presynaptic neuron leading to a significantly greater amount of dopamine within the synapse. Higher doses of cocaine will not release “more dopamine” from the pre-synaptic neuron like meth does. This is why after about 30 minutes or so, people who use cocaine will need more to maintain the high.

Dopamine gets trapped in the synapse (space between nerve cells) because the meth (like cocaine) prevents “transporters” from removing it back into the cell it came from. The postsynaptic cell is activated to dangerously high levels as it absorbs so much dopamine over a long period of time. The person using meth experiences powerful feelings of euphoria, increased energy, wakefulness, physical activity, and a decreased appetite.

When an unnatural amount of dopamine floods the limbic system like this over a long period of time, without reabsorption, then our brain is not replenished with dopamine, hence people who use meth often (even on a single occasion) may feel unmotivated, depressed, joyless, and/or pointlessness when they stop using. Figuratively speaking, the brain is “empty” or low on dopamine fuel, and it will take time to for dopamine to return to baseline levels and replenish itself. This may motivate the user to seek more methamphetamine to return to “normal”.

Methamphetamine can also cause a variety of cardiovascular problems, including rapid heart rate, irregular heartbeat, and increased blood pressure. Hyperthermia (elevated body temperature) and convulsions may occur with methamphetamine overdose, and if not treated immediately, can result in death (What are the immediate (short-term) effects of methamphetamine misuse? | National Institute on Drug Abuse (NIDA) (nih.gov))

SIGNS OF SUBSTANCE MISUSE OR ADDICTION

  • Finding it difficult to meet responsibilities.
  • Withdrawing from activities or not enjoying activities that used to provide satisfaction e.g. work, family, hobbies, sports, socialising.
  • Taking part in more dangerous or risky behaviours e.g., drink driving, unprotected sex, using dirty needles, criminal behaviour.
  • Behaviour changes e.g., stealing, exhibiting violence behaviour toward others.
  • Conflict with partner/family/friends, losing friends.
  • Experiencing signs of depression, anxiety, paranoia, or psychosis.
  • Needing more substance to experience the same effects
  • Cravings and urges to use the substance and symptoms of withdrawal when not using the substance.
  • Having difficulty reducing or stopping substance use.
  • Regretting behaviours while under the influence and continuing to use again.

(Substance abuse, misuse and addiction | Lifeline Australia | 13 11 14)

What Alcohol does to the Human BodyWhat Alcohol does to the Human Body

1. Alcohol (ethanol) enters the body through the oral cavity (i.e., the mouth). The inner surface of the oral cavity is mucosal tissue to keep the cavity lubricated and it is capable of absorbing alcohol into the bloodstream. This absorption is considered “insignificant”.

2. Alcohol flows down the oesophagus to the stomach where 10-20% of ethanol will be absorbed into the bloodstream. Alcohol enters the bloodstream via the mucosal tissue of the stomach wall, and travels straight to the liver. Alcohol can take 5-10 minutes to reach the brain because of the ethanol absorbed via the stomach. If you drink alcohol on an empty stomach, the pyloric sphincter [gateway between the stomach and the small intestine] is going to be more open, and the alcohol is going to immediately enter the small intestine after reaching the stomach. If food is also present in the stomach, the sphincter will open and close at a rate that allows food to enter the small intestine gradually, therefore if alcohol is also in the stomach, it will gradually enter the small intestine.

3. Alcohol flows through the pyloric sphincter into the small intestines where most alcohol absorption occurs. Human intestines are attached the to the posterior abdominal wall by a fold of membrane called the mesentery. Alcohol is absorbed into the mesentery via veins and then travels to the liver.

4. One function of the liver is that it detoxifies toxic elements into non-toxic elements before passing it to the heart and then the rest of the body. The liver sustains considerable “abuse” from a variety of toxic elements and chemicals, and therefore it needs to be capable of full regeneration. NOTE: Many diseases and exposures can harm it beyond the point of repair. These include cancer, hepatitis, certain medication overdoses, and fatty liver disease.

In the liver, ethanol is met with an enzyme called alcohol dehydrogenase and converts ethanol into acetaldehyde [ass-eh-tal-de-hide]. This chemical is more toxic than ethanol, so the liver uses another enzyme to convert acetaldehyde into acetate, which is non-toxic to the human body. NOTE: the amount of alcohol consumed + the timeframe it is consumed [and a variety of other factors] will influence the ability of the liver to effectively convert acetaldehyde all the way into acetate. The liver can’t handle the entire workload effectively therefore ethanol (before being metabolised) will go straight from the liver to the bloodstream and make its way directly to the heart.

NOTE: Genetics will play a role! Certain people do not produce the liver enzymes in enough quantity to properly breakdown ethanol.

5. Blood leaves the liver through the hepatic veins. The hepatic veins carry blood to the inferior vena cava—the largest vein in the body—to the right side of the heart. The heart will beat and send the incoming blood to the lungs to oxygenate and expel carbon dioxide as we breath out. This is how ethanol can be on your breath. Inside the lungs, at the very end of the bronchioles, are hollow air sacs called alveoli where there is a gas exchange. Ethanol evaporates through capillaries into the air sacs and exhaled out of the body. Breathalysers can detect the quantity of ethanol in a person’s system based on the quantity of ethanol in our breath.

6. Not all the ethanol will expel from the body via the breath. The rest will flow back to the heart, with newly oxygenated blood, and then get pumped all the way up to the brain and around the body. NOTE: Ethanol is water soluble. It will be distributed to every cell in the body except bone and fatty tissue [some will enter fat cells but not easily]. Ethanol will interact with every other cell i.e., every organ, gland, nerve, muscle etc.

7. Ethanol will affect and compromise protein synthesis inside muscle tissue. Therefore, if you have been training at the gym, running, swimming etc., your muscles will not effectively be able to repair.

8. Once ethanol has reached the brain, it will cross the blood-brain barrier and begin to affect chemical messengers [neurotransmitters] in the grey matter of the brain. It affects serotonin, dopamine, gamma-amino-butyric-acid (aka GABA), glutamate, endorphins etc. The person will experience pleasure, euphoria, lowered inhibitions [related to dopamine], lowered cognitive ability (e.g., decision making/problem solving, emotion regulation) and lowered coordination and reflexes.

The more ethanol ingested, the more dopamine is secreted and communicated between neurons (i.e., nerve cells). One of dopamine’s functions is to make you feel pleasure or ‘rewarded’ for doing things that are good for humans, hence, from an evolutionary perspective, we are likely to do them again to help us thrive in our environment and social world. Dopamine is secreted when we:

  • eat healthy foods (but also recently developed processed foods that are high in sugar and salt)
  • exercise
  • achieve goals
  • be productive (e.g., finish a task like cleaning, cooking, work-related tasks)
  • master new skills (e.g., learning an instrument or a new talent), and
  • have positive and stimulating social interactions

Ethanol influences so much dopamine secretion and communication that the brain becomes unable to make responsible decisions cognitively. The simultaneous experience of euphoria and lowered cognitive ability means we are more likely to be “happy” about making irresponsible decisions.

Increased dopamine is how drinking alcohol “blocks” unpleasant emotions like fear, stress, anxiety, and insecurity. When we don’t feel these unpleasant, yet necessary, emotions we will behave in ways that are dangerous, abnormal, potentially embarrassing, and generally problematic.

Another significant brain region affected by ethanol is the hypothalamus and the pituitary glad [together known as the hypothalamic-pituitary axis]. These structures control the entire hormonal system. The hypothalamus monitors the body, and it will send instructions to the pituitary gland based on information it receives from the hypothalamus. The hypothalamus is aware that ethanol is flooding the brain and it starts adjusting the secretion of hormones via the pituitary gland.

One of the instructions it gives the pituitary gland is to start modulating the adrenal glands to secrete cortisol (i.e., stress hormone) and epinephrine and norepinephrine (i.e., adrenaline).

Now, our cognitive capacity is diminished, inhibitions are lowered, and we will experience a rush of stress hormones and adrenaline coursing through the body. Cortisol and adrenaline will provide a boost of energy. It will increase the heart rate, blood pressure, body sweat, sugar levels in the bloodstream, and enhances the brain’s ability to use glucose. Glucose is a “fuel” source for brain functioning, including the generation of neurotransmitters. Behaviourally, we can see this in children when we say they are “hyperactive” because they’ve ingested too much sugar.

The pituitary gland will also slow the secretion of anti-diuretic hormone (aka. vasopressin). A diuretic is something that makes us urinate. If the anti-diuretic hormone (also called vasopressin) slows down, then we won’t be “holding on” to water as effectively, hence we begin to urinate more. People call this “breaking the seal”.

9. South of the body, blood is pumped into the kidneys via the renal artery which spreads through the renal cortex. The blood is then filtered into urine and expelled from the body. The lowered anti-diuretic hormone will dilate (become wider/bigger or more open) blood vessels in the kidneys which means more blood gets passed through and filtered, but it also means we lose a lot more body water which leads to dehydration. Vasopressin is essential in the control of osmotic balance, blood pressure regulations, and kidney function, therefore, when vasopressin is lowered, we are losing essential water and minerals/electrolytes. Electrolytes are involved in urination because the kidneys need them to make the process of filtering blood more efficient.

The loss of water and electrolytes will contribute to a hangover. Electrolytes play a role in cellular water absorption so if we are losing more water than we are bringing in, and we are losing the electrolytes that support the absorption of water, we become dehydrated very quickly.

10. The Hangover

Symptoms: nausea, fatigue, diarrhoea, vomiting, paranoia, anxiety, anorexia (i.e., loss of appetite), increased thirst, muscle weakness, irritability, sweating, increased blood pressure, and headache.

The exact cause of a “hangover” is not yet known however variables affecting the hangover are:

  • individual differences such as sex, size, body fat, genetics etc
  • lack of sleep
  • general health
  • drinking behaviour e.g., frequency, duration, quantity
  • food intake before and during
  • water intake before and after
  • your body’s ability to metabolise alcohol i.e., excessive amounts of acetaldehyde due to fewer enzymes to metabolise alcohol in the liver before entering the bloodstream
  • general behaviour while drinking e.g., poly-substance use, dancing, sexual activity, risk-taking behaviours etc.

Strategies for Controlled Drinking

  • Setting personal drinking limits and sticking to it
  • Alternating alcoholic drinks with soft drinks i.e., one alcoholic drink then a water, soft drink, or juice
  • Have a meal before drinking
  • Switching to low alcohol drinks
  • Having regular alcohol-free days/weeks/months
  • Identifying high risk situations for heavy drinking and creating a management plan

Engaging in alternative activities to drinking

Unhelpful Cognitions (thoughts) and DistortionsUnhelpful Cognitions (thoughts) and Distortions

Unhelpful Cognitions

Mental Filter: This thinking style involves a “filtering in” and “filtering out” process – a sort of “tunnel vision”, focusing on only one part of a situation and ignoring the rest. Usually this means looking at the negative parts of a situation and forgetting the positive parts, and the whole picture is coloured by what may be a single negative detail.

Jumping to Conclusions: We jump to conclusions when we assume that we know what someone else is thinking (mind reading) and when we make predictions about what is going to happen in the future (predictive thinking).

Mind reading: Is a habitual thinking pattern characterized by expecting others to know what you’re thinking without having to tell them or expecting to know what others are thinking without them telling you. This is very common, and most people can identify. Oftentimes, when we are telling someone a story about an interaction, we’ve had with someone else, we will make mind reading assumptions without actually having fact or evidence e.g., “They haven’t phoned me in two weeks so they must be angry with me for cancelling on them last week.”

Personalisation: This involves blaming yourself for everything that goes wrong or could go wrong, even when you may only be partly responsible or not responsible at all. You might be taking 100% responsibility for the occurrence of external events. It can also involve blaming someone else for something for which they have no responsibility. This can often occur when setting a boundary with someone and you take responsibility for their guilt or anger.

Catastrophising: Catastrophising occurs when we “blow things out of proportion” and we view the situation as terrible, awful, dreadful, and horrible, even though the reality is that the problem itself may be quite small.

Black & White Thinking: Also known as splitting, dichotomous thinking, and all-or-nothing thinking, involves seeing only one side or the other (the positives or the negatives, for example). You are either wrong or right, good or bad and so on. There are no in-betweens or shades of grey.

Should-ing and Must-ing: Sometimes by saying “I should…” or “I must…” you can put unreasonable demands or pressure on yourself and others. Although these statements are not always unhelpful (e.g., “I should not get drunk and drive home”), they can sometimes create unrealistic expectations.

Should-ing and must-ing can be a psychological distortion because it can “deny reality” e.g., I shouldn’t have had so much to drink last night. This is helpful in the sense that it communicates to us that we have exceeded our boundaries, however, saying “shouldn’t” about a past situation can be futile because it cannot be changed.

Overgeneralisation: When we overgeneralise, we take one instance in the past or present, and impose it on all current or future situations. If we say, “You always…” or “Everyone…”, or “I never…” then we are probably overgeneralising.

Labelling: We label ourselves and others when we make global statements based on behaviour in specific situations. We might use this label even though there are many more examples that are not consistent with that label. Labelling is a cognitive distortion whereby we take one characteristic of a person/group/situation and apply it to the whole person/group/situation. Example: “Because I failed a test, I am a failure” or “Because she is frequently late to work, she is irresponsible”.

Emotional Reasoning: This thinking style involves basing your view of situations or yourself on the way you are feeling. For example, the only evidence that something bad is going to happen is that you feel like something bad is going to happen. Emotions and feelings are real however they are not necessarily indicative of objective truth or fact.

Magnification and Minimisation: In this thinking style, you magnify the positive attributes of other people and minimise your own positive attributes. Also known as the binocular effect on thinking. Often it means that you enlarge (magnify) the positive attributes of other people and shrink (minimise) your own attributes, just like looking at the world through either end of the same pair of binoculars.

(CCI, 2008)

Emotions: Function and MotivationEmotions: Function and Motivation

Joy or happiness can motivate us to join in, take part, flourish, share, be a part of, repeat these activities.

Fear can motivate us to get away, hide, flee, run, keep ourselves or others safe. It protects us.

Sadness can motivate us to withdraw, ruminate, cry, heal, express hurt, seek comfort and bond with others.

Anger can motivate us to attack, defend or stand up for ourselves, identify boundary violation, identify there is a threat to our self or our loved ones or something we value.

Guilt can motivate us to repair what we have done and informs us that we have violated our morals or values.

Shame can motivate us to hide away, to keep things secret, to remember our fallibility and humility, to keep us “right sized”.

Disgust can motivate us to withdraw, keep a distance, get clean or clean our environment to ensure we stay healthy.

Compassion, empathy, or sympathy can motivate us to offer comfort, be with others, relate to one another and form strong bonds.

Confusion (Cognitive with physical sensations) can motivate us to get curious, learn, discover, grow.

Affection (behavioural with physical sensations) can motivate us to give love, get close to specific people who were feel safe with, and want to spend more time with.

Quality Social Connections (Relationships)Quality Social Connections (Relationships)

Did you know that through a series of controversial (and incredibly sad) experiments, psychologist Harry Harlow, was able to demonstrate the importance of early attachments, affection, and emotional bonds on the course of healthy development. Harlow discovered that love and affections may be primary needs that are just as strong as or even stronger than those of hunger or thirst.

1 Think positive

This sounds easier said than done. I challenge you to intentionally consider alternatives to your habitual, default thinking pattern. We all want to be liked by others – because we want to belong to a group and to feel valued, needed and wanted. Worrying about social situations is very natural because we want to be perceived by others in a certain way. Other people’s perceptions are out of our control. So, we worry about it. We worry about things that are out of our control. We also know that we control our own behaviour, therefore, we feel responsible for behaving in ways that will mesh with others. We believe the likelihood of being liked will increase if we behave in certain ways.

Worrying can become problematic if we overthink past and future interactions, and perhaps we choose to avoid some or all interactions to protect ourselves. But then we don’t get the social connection we need.

I challenge you to think positive. Choose that instead. It will take energy because it might not be your default thinking pattern. Set your positive intention. Use mental energy. Trust that the opposite of your thinking can be true as well.

2 Forget comparison – unless you are a clone of someone else, you don’t have their genes, their life experience, their upbringing, their family history etc. It’s kind of illogical to compare yourself to someone else if you think about it, hey.

Don’t be concerned if others appear to have more or better friends than you. Quality and enjoyment matter more than quantity. Savour the moments of connection, wherever you can find them.

3 Anticipate change

Our life circumstances can leave us vulnerable to a sense of isolation. Relationships shift over time, and we may lose touch with friends who were once important. People form new relationships, move away, start families, become busier at work or start studying etc. Accepting change as normal can help you adjust to a change in your relationships. Just as we grow, evolve, and change, so will our relationships. Couples who were once in love will fall out of love. And friendships that were once enjoyed may become less enjoyable overtime.

4 Tolerate discomfort

Anxiety may cause you to avoid socialising. Understand that feeling awkward or embarrassed in social situations does not mean you are doing anything “wrong”. I remember a period I went through growing up. I noticed people around me starting to use for sophisticated language. I thought I had nothing of value to say, or nothing of interest. I would struggle to form sentences in my head. I was becoming so anxious that my social cognition was compromised. Learning to be comfortable with myself, relaxing into conversations, and listening more deeply to the other person helped me. I remember going on dates thinking I have absolutely nothing to say to this person. That cognition, that thought, wasn’t true. It was part of a larger story that I was creating in my mind.

Reach out to others and your skills will improve with time.

5 Listen well

Practice listening. Ask questions and really listen to the answers, rather than just waiting for your turn to talk, or worrying about how you will respond. If you’re curious about what someone is saying, your mind will naturally form a question or recall a similar experience that you can share.

Respond warmly to people’s experiences through your posture, facial expressions and words. Put the mobile phone away and be present.

6 Rehearse

Out of practice with small talk? Spend some time thinking about questions you can use when conversation stalls. You might ask if the other person has been overseas or travelled, what music do they like, or what movies they like to see at the cinema. A natural question to ask is what did you get up to today? What do you have planned for the weekend?

I once attended a training for work. The facilitator shared her experience of often finding herself in similar situations, and she decided to formulate a “go-to” script for when she became tense, and a conversation stalled. Rather than panic, she had a mental go-to script to bridge the gap until the conversation returned to a natural flow. Sometimes it’s nice to allow for a silence, scan your environment and discuss something happening around you.

7 Go offline

Social media helps many people, but it can also increase disconnection, depression, loneliness, anxiety, and headaches. Ensure you have a healthy offline life. Perhaps invite trusted online friends to an offline meeting to build your relationship.

8 Help and service

Helping someone gives a feel-good rush. Oxytocin and dopamine neurotransmitters have been shown to be involved in human bonding. These chemicals can make us feel pleasure. Create a bond with someone by offering help or asking for it. If we’re not someone who asks for help often, the people who know us well will likely feel closer to you because you need them for something, nourishing the bond you have. Have you noticed that strangers in the street are often very willing to help someone with directions? It makes people feel good to help others and be helped in return. Something as little as assistance with a bag or holding a lift can help people feel seen and cared for.

9 Get involved

I know this one may make some people go “Eeeeek” and cringe. However, evolutionary and developmental psychology … and all psychology, has suggested time and time again, that feeling part of a larger community and getting involved makes us feel alive and part-of. Joining in connects you to other people, unites you in a shared activity, and provides an easy way to get to know people better.

Have you ever watched a group of people in the street having a laugh, or watched people playing a sports game, or doing an activity together – while you’re sitting alone on the outside. You might mock them to yourself to make yourself feel superior or protected. We’d rather be part of. It’s just the truth.

10 Manage stress

Everybody has some social situations they dread. Practice simple stress management techniques, such as breathing deeply and slowly, to help keep your stress in check through awkward moments.

We need stress to perform optimally. Befriend your stress. When it becomes overwhelming, recognise that it’s happening, allow it to be there, investigate where it’s living in your body, and nurture that part of yourself. Talk to a trusted friend in times of excessive or toxic stress. Do whatever you need to come back home to yourself. Rest. Drink water. Eat nutritious food. Shower or bathe. Spend time outdoors in nature. Watch something on tv. Listen to music. Come home to your true self, recharge the batteries, and then jump back in. You’re allowed to switch off for a while.

11. Practice, practice, practice

Relationship skills can be learnt. Don’t be discouraged. Remember that social connections are good for you. If you feel like you need support to build better connections skills, a counsellor or therapist can help.

We learn from new experiences. They create, wire, and strengthen, neural pathways in the brain. You can be silent and listen during social interactions. Get curious about the other person. Ask questions. Share some of your story and ideas. And breath. Practice makes progress – not perfection.

Addiction TheoriesAddiction Theories

There have been various theories and models proposed over time to help us understand why individuals use alcohol and other drugs, and why some people become dependent or ‘addicted’ but not others. The following are several models or theories of addiction. They reflect the political, medical, spiritual, and social forces of those times in history.

The Moral Model

Alcohol and tobacco was introduced in the Western countries during the 1500’s. The widespread use and misuse of chemical substances resulted in a range of social problems and it was thought by some that substance use was “problematic” and “morally wrong” (Lassiter & Spivey, 2018). The moral model viewed AOD dependency as a moral and personal weakness that involved a lack of self-control, and was often viewed as a potential danger to society (Stevens & Smith, 2014).

The moral model considered addiction a “sin” and a result of free, yet irresponsible, choice. Therefore, many politically conservative groups, religious groups, and legal systems tended to punish the individual who uses AOD. The moral model or attitude towards addiction can still be seen today in certain cultures. Those who still believe addiction is morally “wrong” tend to perceive the most appropriate way to treat the individuals who use AOD are through legal sanctions, such as imprisonment and fines. For example, in many countries, drivers who are caught under the influence of alcohol or other drugs are not considered for treatment programs but instead receive court sentences as punishments (Fisher & Harrison, 2017).

This model has been rejected by alcohol and other drugs professionals as unscientific and contributes to the stigma surrounding addiction and substance use (White, 1991, cited in Fisher & Harrison, 2017).

The Disease Model

This model takes up the medical viewpoint and proposes addiction as a disease or illness that an individual has. It proposed that addiction is a disease that is progressive and chronic whereby the individual holds no control as long as the substance use continues. In other words, their addiction will continue to deteriorate with the continuous AOD (Thombs & Osborn, 2019). It also proposes that individuals who uses AOD can never be cured from addiction, though it can be readily treated through sustained abstinence such as self-help fellowships and treatment community. 

In the 1940s, Jellinek proposed a disease model in relation to alcoholism, arguing that it is a disease caused by a physiological deficit in an individual, making the person permanently unable to tolerate the effects of alcohol (Stevens & Smith, 2014). Jellinek identified signs and symptoms and clustered them into stages of alcoholism, as well as progression of the disease, which form the basis of 12-step or Anon-type programs (e.g., Alcoholics Anonymous and Narcotics Anonymous; Stevens & Smith, 2014). 

Under the disease model, treatment requires complete abstinence. Once an individual has accepted the reality of their addiction and ceased substance use, they are labelled as being in recovery, but are never ‘cured’ (e.g., “Once an alcoholic, always an alcoholic”; Thombs & Osborn, 2019). Whilst originally applied to alcohol dependency, it has now been generalised to other substances and many traditional substance use treatment models are based on this model (Capuzzi & Stauffer, 2020; Stevens & Smith, 2014).

The disease model offered an alternative to the moral theory, helping to remove the moral stigma attached to addiction and replacing it with an emphasis on treatment of an illness (Capuzzi & Stauffer, 2020). Disease theory helped to explain how some people experience the physiological effects of addiction such as dependence, tolerance, and withdrawal more than others, and how these mechanisms are caused by a biochemical abnormality in an individual which increases their likelihood of developing a dependency (DiClemente, 2018). 

While the disease model was well received by a range of professionals, many criticised it because research did not find that the progressive, irreversible progression of addiction through stages always occurs as predicted (Capuzzi & Stauffer, 2020). Additionally, many in the AOD field argued that the model did not address the complex interrelated factors that accompany dependency (Stevens & Smith, 2014). Finally, some professionals argued that the concept of addiction being a disease may also convey the impression to some individuals that they are powerless over their dependency and/or not responsible for the consequences of destructive addictive behaviours, which can be counteractive to treatment (Capuzzi & Stauffer, 2020).

Genetic and Neurobiological Theories

These theories suggest that some people may be genetically predisposed to develop drug dependency. For example, individuals usually begin substance use on an experimental basis. They then continue using because there is some reinforcement for doing so (e.g., a reduction of pain, experience of euphoria, social recognition, and/or acceptance, etc.). Some people may continue to use substances in a controlled or recreational manner with limited consequences while others progress to non-medical use and eventually develop a dependency. Why? Genetic and neurobiological theories propose that this is the result of a genetic predisposition to drug dependency (Fisher & Harrison, 2017). 

Factors being considered by researchers in the genetic transmission of dependency on alcohol include neurobiological features such as an imbalance in the brain’s production of ‘feel good’ neurotransmitters or in the metabolism of ethanol, which is the key component of alcohol (Stevens & Smith, 2014). Other researchers explored genetic differences in temperament and personality traits which they argued may lead to certain individuals becoming more vulnerable in the face of challenging environmental circumstances, leading to AOD use (Stevens & Smith, 2014). Genetic predispositions such as these may explain why some individuals develop dependency on AOD while others in similar situations do not.

The Psycho-dynamic Model

This model proposes that substance use may be due to an unintentional response to some difficulties that an individual experienced in their childhood. This explanation is based on the theory that was put forward by Sigmund Freud, whereby the problems of whether we are able to cope with difficulties as adults are linked to our childhood experience. Many counselling approaches today are based on this theory which aim to seek understanding of people’s unconscious motivations and to enhance how they view themselves (Capuzzi & Stauffer, 2020).

The Psycho-dynamtic model also believes that AOD use is often secondary to a primary psychological issue. In other words, alcohol and other drugs is a symptom rather than a disorder, and AOD use is a means to temporarily relieve or numb emotional pain. For example, an individual suffering from depression might self-medicate with stimulants to relieve the enervating effects of depression or manage their anxiety by using benzodiazepines (Fisher & Harrison, 2017). 

There is evidence to support this model, whereby childhood traumatic events are associated with mental health problems and substance use disorders. Wu et al. (2010) conducted a study among 402 adults who were receiving substance use disorder treatments. They revealed that almost all (95%) of the participants experienced one or more childhood traumatic events, and 65.9% of them experienced emotional abuse and neglect from their childhood. The authors also reported that the higher the number of childhood traumatic events experienced, the higher the risk of substance use disorders and mental health problems such as post-traumatic stress disorder. 

Personality Traits

Some theorists suggest that certain individuals have certain personality traits that are linked to AOD dependency. For example, dependency on alcohol has been associated with traits such as developmental immaturity, impulsivity, high reactivity and emotionality, impatience, intolerance, and inability to express emotions (Capuzzi & Stauffer, 2020).

Social Learning Model

This model suggests that social learning processes such as observing other peoples behaviours (i.e., modelling) and cultural norms are important in the process of learning behaviours. Albert Bandura proposed Social Learning Theory which would argue that substance use is initiated by environmental stressors or modelling people around you with “perceived status”. For example, a child observes their parents use alcohol in social situations and the child is therefore more likely to perceive that AOD use for social situations is appropriate (Harrison & Fisher, 2017); the association between socialisation and alcohol has been established.

The social learning model also recognises the influence of cognitive processes such as coping, self-efficacy, and outcome expectancies. Some researchers are currently focusing on how an individuals expectation of the effects of drugs influence the pattern of AOD use and resulting dependency. Russell (1976, cited in Wise & Koob, 2013) suggested that dependency on substance is not only chemical (biological) but also behavioural and social in nature. 

It has also been suggested that substance use occurs when an individual thinks substance use is a coping mechanism. This can be learned from television and film, social medial, peer influence, or messages from caregivers during childhood. The individual hopes the AOD use will relieve from them from stress (Stevens & Smith, 2014). 

Socio-cultural Model

Different from the previous models, the socio-cultural model perceives substance use as an issue of society as a whole instead of focusing only on the individual. People tend to overestimate the influence of internal and psychological factors while underestimating the external and environmental factors, even among some alcohol and other drugs workers (Gladwell, 2000, cited in Lewis, Dana, & Blevins, 2015). Thus, this model highlights the importance of how society shapes substance use behaviours, such as cultural attitudes, peer pressures, family structures, economic factors, and more (Bobo & Husten, 2000). For example, Coffelt et al. (2006) found that parents’ alcohol use are associated with their children’s drinking behaviour, whereby when the adult’s alcohol problems increased, the likelihood of their adolescent child’s alcohol use increased. 

The Biopsychosocial Model

Substance use behaviour cannot be explained or understood scientifically or spiritually based on a single variable, antecedent, or “cause”. Biological, psychological, learning, social and cultural context all contributes to explaining why addiction develops and maintains. The interactions between these factors are presented in The Biopsychosocial Model – arguably the most commonly used model to explain addiction today. The model suggests that substance use and the progression of substance dependency can be explained by recognising that the body and mind are connected within a social and cultural context (Skewes & Gonzalez, 2013).

The model allows any combination of biological, psychological, social and cultural factors to contribute to AOD misuse and dependency, rather than a single dominating factor. This is much more holistic and integrative when attempting to understand the determinant of addiction (Stevens & Smith, 2014).

References:

  1. Bobo, J. K., & Husten, C. (2000). Sociocultural influences on smoking and drinking. Alcohol Research and Health, 24(4), 225-232. 
  2. Capuzzi, D., & Stauffer, M. D., Sharpe, C. W. (2020). History and etiological models of addiction. In D. Capuzzi, & M. D. Stauffer (Eds.), Foundations of addictions counseling (pp. 1-22). Pearson Education.
  3. Coffelt, N. L., Forehand, R., Olson, A. L., Jones, D. J., Gaffney, C. A., Zens, M. S. (2006). A longitudinal examination of the link between parent alcohol problems and youth drinking: The moderating roles of parent and child gender. Addictive Behaviours, 31, 4, 593-605. https://doi.org/10.1016/j.addbeh.2005.05.034 
  4. DiClemente, C. C. (2018). Addiction and change: How addictions develop and addicted people recover. The Guilford Press.
  5. Fisher, G. L., & Harrison, T. C. (2017). Substance abuse: Information for school counsellors, social workers, therapists, and counsellors. Pearson Education. 
  6. Lassiter, P. S., & Spivey, M. S. (2018). Historical perspectives and the moral model. In P. S. Lassiter, & J. R. Culbreth (Eds.), Theory and practice of addiction counselling. (pp. 27-46). Sage Publications. 
  7. Lewis, J. A., Dana, R. Q., & Blevins, G. A. (2015). Substance abuse counselling. Cengage Learning.
  8. Skewes, M. C., & Gonzalez, V. M. (2013). The biopsychosocial model of addiction. In P. M. Miller, A. W. Blume, D. J. Kavanagh, K. M. Kampman, M. E. Bates, M. E. Larimer, N. M. Petry, P. D. Witte, S. A. Ball (Eds.), Principles of addiction: Comprehensive addictive behaviours and disorders (pp. 61-70). Academic Press.
  9. Stevens, P., & Smith, R. L. (2014). Substance abuse counselling: Theory and practice. Pearson Education. 
  10. Teesson, M., Hall, W., Proudfoot, & Degenhardt, L. (2012). Addictions. Taylor & Francis Group.
  11. Thombs, D. L., & Osborn, C. J. (2019). Introduction to addictive behaviours. The Guilford Press. 
  12. Wise, R. A., & Koob, G. F. (2013). The development and maintainance of drug addiction. Neuropsychopharmacology, 39, 254-262.
  13. Wu, N. S., Schairer. L. C., Dellor, E., & Grella, C. (2010). Childhood trauma and health outcomes in adults with comorbid substance abuse and mental health disorders. Addictive Behaviors, 35(1). 68-71. https://doi.org/10.1016/j.addbeh.2009.09.003