Theories of addiction and interventions or therapies for addiction

What you'll learn

• How biological and psychological explanations account for addiction.
• What Kaij's twin study of alcohol abuse shows about genetic vulnerability.
• How aversion therapy and self-management programmes aim to reduce addictive behaviour.
• How to evaluate addiction theories and therapies using reductionist and holistic perspectives.

Starting point: what is addiction?

Addiction can involve substances, such as alcohol, nicotine or drugs, or behaviours, such as gambling. In GCSE Psychology, the key idea is that addiction is not explained by one simple cause. We study both nature and nurture.

This topic fits together like this:

Theories of addiction

Biological explanation: hereditary factors and genetic vulnerability

The biological explanation says that addiction may be partly caused by hereditary factors. These are characteristics passed from biological parents to children through genes.

For example, someone with a family history of alcohol abuse may be at higher risk of developing alcohol addiction. This might be because inherited biological factors affect things like reward, impulsivity, stress responses or sensitivity to alcohol.

The key point is risk, not destiny. A person can have genetic vulnerability but never develop an addiction, especially if their environment is protective.

Kaij's twin study of alcohol abuse

Kaij's twin study of alcohol abuse is the named study linked to the biological explanation.

Aim

Kaij aimed to investigate whether alcohol abuse has a genetic basis by comparing alcohol abuse in identical and non-identical twins.

Method

Kaij used a twin study of Swedish twins. The study compared whether both twins in a pair showed alcohol abuse. If identical twins had higher concordance for alcohol abuse than non-identical twins, this would suggest a genetic influence.

Results

Kaij found that identical twins were more likely to both show alcohol abuse than non-identical twins.

Conclusion

This supports the biological explanation because identical twins share more genes, so higher concordance suggests inherited factors can increase vulnerability to alcohol abuse.

However, concordance was not 100%. This matters because it shows genes cannot be the only explanation. Environmental influences must also play a role.

Evaluation of Kaij's twin study

A strength is that twin studies are useful for separating genetic and environmental influences. If identical twins show higher similarity than non-identical twins, this supports a biological explanation.

A weakness is that identical twins may be treated more similarly than non-identical twins. This means their similarity might be due partly to environment, not just genes. For example, identical twins may share the same friendship groups or be encouraged to behave similarly.

Another issue is generalisability. If the sample was mainly from one country or one cultural context, the findings may not apply equally to all societies.

Ethically, research on addiction can be sensitive because it may involve stigma. Researchers should protect confidentiality, gain informed consent where possible, allow the right to withdraw, and debrief participants sensitively.

Psychological explanation: peer influence

The psychological explanation in this topic focuses on peer influence.

Peers can influence addiction in several ways:

• Direct pressure: friends openly encourage someone to drink, smoke or gamble.
• Modelling: a person copies peers who seem confident, popular or rewarded for addictive behaviour.
• Social approval: addictive behaviour may be seen as a way to fit in.
• Availability: peers may make it easier to access alcohol, cigarettes, drugs or gambling opportunities.

For example, a teenager may start vaping because their friendship group does it at parties. At first, the behaviour may be about belonging. Over time, it may become harder to stop.

Evaluation of peer influence

A strength is that peer influence explains why addiction often begins in social situations. It is especially useful for explaining initiation, such as first drinking alcohol or first trying nicotine.

It also has practical value. If peer influence contributes to addiction, interventions can focus on resisting pressure, building confidence and changing social environments.

A weakness is that it can be difficult to prove cause and effect. People may choose friends who already share their interests, rather than being changed by those friends. This is called a problem of direction: do peers cause the behaviour, or do similar people become peers?

Peer influence also does not explain why only some people in a friendship group become addicted. Biological vulnerability, personality, stress and family background may affect who is most at risk.

Interventions or therapies for addiction

An intervention is a planned method used to reduce a problem behaviour or improve mental health. For addiction, the goal is often to reduce cravings, reduce harmful behaviour, prevent relapse and improve control.

Aversion therapy

Aversion therapy is based on classical conditioning, which is learning by association. If alcohol is repeatedly paired with nausea, the person may begin to feel disgust or anxiety when they think about drinking. This may reduce cravings and make relapse less likely.

For alcohol addiction, a person might be given a drug that causes sickness when alcohol is consumed. For gambling addiction, gambling-related images might be paired with an unpleasant stimulus. The aim is to make the addictive behaviour less rewarding.

Evaluation of aversion therapy

A strength is that aversion therapy directly targets the addictive behaviour. It can be useful when someone is highly motivated to stop and wants a clear behaviour-change technique.

A weakness is that it may not deal with the deeper causes of addiction, such as stress, peer pressure or genetic vulnerability. This means relapse can happen if the person returns to the same triggers.

There are also ethical concerns. Aversion therapy deliberately creates discomfort, so therapists must gain informed consent, protect the person from harm, monitor distress and allow them to withdraw.

Self-management programmes

Self-management programmes can include self-help groups, where people with similar difficulties support each other, and 12 step recovery programmes, which use a structured set of recovery steps. These often include admitting there is a problem, seeking support, avoiding triggers and helping others in recovery.

Self-management programmes may help because they:

• give social support from people who understand addiction
• reduce isolation and shame
• teach coping strategies for cravings and stress
• encourage responsibility and long-term behaviour change
• provide role models who show recovery is possible

Evaluation of self-management programmes

A strength is that self-management programmes are more holistic than aversion therapy. They can address behaviour, thoughts, emotions and social support.

They are also often accessible and low cost. A person may continue attending support groups for months or years, which can help with relapse prevention.

A weakness is that they rely on motivation and regular attendance. If someone is not ready to change, or feels embarrassed in groups, the programme may be less effective.

There may also be confidentiality issues in group settings. Members should respect privacy, and facilitators should make expectations clear. People should also feel able to leave without pressure.

How interventions improve mental health

Both aversion therapy and self-management programmes aim to improve mental health by reducing addictive behaviour and increasing control.

Reduced addiction can improve:

• mood and self-esteem
• relationships with family and friends
• physical health and sleep
• school, work or daily routines
• feelings of hope and independence

However, the therapies work in different ways. Aversion therapy focuses mainly on changing the learned association with the addictive behaviour. Self-management focuses more on the person’s wider life, including triggers, support and coping strategies.

Reductionist and holistic perspectives

The biological explanation can be seen as reductionist because it focuses on genes. This is useful because it is clear and scientific, but it may ignore peer pressure and life experiences.

Peer influence is also partly reductionist if it explains addiction only through friends. It may ignore why some people resist peer pressure while others do not.

Aversion therapy is reductionist because it focuses on one learned association. Self-management programmes are more holistic because they can include social support, coping skills, motivation, identity and relapse prevention.