Understanding Addiction: Genetic vs. Environmental Factors

Introduction

What causes addiction? An age old question!

Here we examine addiction through the lens of genetic and environmental factors.

It is somewhat of a “What came first, the chicken or the egg”? argument.

While this is an interesting, if not, at times, a controversial topic, the treatment for addiction doesn’t change: Whatever the cause.

Let our experienced addictions clinicians share their knowledge and advice with you.

Exploring the Genetic Foundations

Addiction: Genetic and environmental influences shape this complicated illness, which can be heavily influenced by genetics.

Recent research shows how genomics and neurobiology advances have highlighted how inherited genetics can make some people more susceptible to addiction than others.

These new developments also show that there may be the potential for more personalized treatments. Understanding addiction: genetic and environmental influences is key in tailoring these interventions.

Genetic Contributions to Addiction

What role does genetics play in addiction susceptibility?

Genetics have a marked impact on someone’s likelihood of developing an addiction problem as it affects the brain’s pathways that are involved with reward, drug metabolism, and impulse control.

In particular, research shows that there are variations among specific genes:

• Dopamine receptors
• Opioid receptors
• Alcohol metabolism

This means that different people’s brains react to the presence of alcohol, dopamine, and opioids in different ways.

We also know that genetics account for between 40-60% of someone’s addiction risk.

This means that if there is addiction in the family, there is a much greater chance you will succumb to the problem.

Preventing addiction

Recognizing addiction: genetic and environmental influences can aid in prevention strategies.

These genetic features make a difference in how someone responds to drugs and alcohol. They can directly impact the way your brain processes the presence of drugs and alcohol on receptors.

In time, a greater understanding of these genetic influences may be able to guide personalized treatment plans that consider addiction’s genetic and environmental influences.

It may be possible, in the future, to identify, through genetic testing, those who are at risk for early intervention.

The Science

What is the current science of the genetic basis of addiction?

We know, from research, that addiction is heavily influenced by genetics. We also know that it is not a single gene that is responsible, but that there are a combination of genetic variations that lead to addiction.

One example is OPRM1 which is linked to the brain’s response to the presence of opioids on opioid receptors. Another example is ADH1B and ALDH2 which are concerned with alcohol receptors.

There are believed to be over one hundred genetic variations, known as single nucleotide polymorphisms, that are involved in different types of drug addiction.

Current research shows that these risk variants can influence how the brain’s reward systems work, most likely when Dopamine is involved (pleasure and motivation.)

Does addiction run in the family?

Some research suggests that, where there is addiction in the family, an individual can be up to 7 times more likely to develop addiction than someone who doesn’t have addiction in the family.

Genetics, however, are not the only factor. The person’s environment, their social pressures, and childhood trauma are all contributive factors. Thus, addiction: genetic and environmental influences must both be considered.

Research, while exciting, is what it is: research. It is costly and time-consuming. While it provides exciting insights into the future of addiction treatment, we are not there: yet.

Learned Behavior

Addiction is not just down to your genetics.

Peers, easy access to drugs and alcohol, unresolved trauma: These all have their part to play.

If you have a genetic predisposition to addiction but are in a stable environment with no significant trauma and no easy access to drugs you may never experience a problem. This highlights the interaction of addiction: genetic and environmental influences.

However, if you are in a high-stress environment, have unresolved trauma, and have access to drugs, a genetic predisposition may be the tipping point.

Addiction comes around when genetics and social factors collide. This means prevention is possible.

Speak To An Experienced Addictions Clinician

We are a collective of experienced addictions clinicians who work in this field.

Our advice is free, confidential and impartial. We do not charge if you would like a referral to a rehab centre.

We are registered with the Information Commissioners Office and only signpost to centres registered with the Care Quality Commission or the appropriate body for Wales/Scotland/N.Ireland.

The next steps

The science and debate as to what causes addiction is an interesting one. Some people say it is caused by a persons genetics, others their environment. Others say it is both!

Whatever the cause, the treatment is the same.

Addiction can be overcome.

Call and speak with an experienced addictions clinician on all aspects of addiction including: Detox, rehab, therapy, relapse prevention and aftercare.

Our clinicians can provide treatment options, locations, costings and availability.

We make no charge for advice or treatment referrals.

Recent Posts

Is Ketamine an opioid?

Is Ketamine an opioid? No! End of blog. Well, not quite! Opioids lead to addiction and physical health problems and can also lead to fatality. Ketamine is an anaesthetic and prolonged use also leads to addiction, health problems and can also, sadly, lead to a fatality. As easily available as opioids Ketamine is very widely…

Grace Kennedy

4:45 pm, June 19, 2026

Why is Cocaine so addictive?

Why is Cocaine so addictive? It is all down to science. The effect Cocaine has on the brain, and in turn, the effect it has on your behaviour and your body is purely down to chemical changes caused by drug use. While there are lots of reasons why someone might take drugs, the effects on…

Grace Kennedy

5:48 pm, June 18, 2026

Is Methadone Addictive?

Introduction Is Methadone Addictive? A question we get asked an awful lot. We could give the answer here in the introduction but the answer is very nuanced. There are more myths floating around the internet about Methadone than there are about Bruce Lee working in Tesco's and the moon landings being fake. It will not…

Grace Kennedy

12:14 pm, June 16, 2026