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Drug addiction rarely starts with a loss of control. It usually starts with something that works — a way to manage stress, pain, anxiety, or the pressure of daily life. Over time, what began as a way of coping becomes something the body and mind depend on.
Understanding what drug addiction is, how it develops, and what can help is a useful starting point — whether you are affected yourself or trying to support someone close to you.
Drug addiction (sometimes called substance use disorder) is a pattern of drug use that becomes compulsive and difficult to stop, even when it is causing harm. It is not a matter of willpower or moral character. The brain and body adapt to the presence of a drug over time, which is why stopping becomes genuinely difficult, not simply a decision someone has not made yet.
Addiction can develop with illicit drugs, prescription medications, or a combination of substances. The pattern varies depending on the drug, the person, and the circumstances around the use — but the underlying mechanism is similar: the drug becomes central to how someone functions, and life starts to be organised around it.
Drug addiction covers a wide range of substances and patterns of use.
Illicit drugs include substances such as cocaine, heroin, ketamine and cannabis. The risks differ significantly between substances. Heroin and other opioids carry a high risk of physical dependence and overdose, while cocaine, ketamine and cannabis can produce powerful psychological patterns of use alongside their own physical and mental health risks.
Dependence can also develop around medication that was originally prescribed for pain, anxiety, sleep or another genuine medical need. Because the recognition questions and withdrawal risks are different, this is covered separately on our prescription drug addiction page.
Polysubstance use means using more than one drug or combining drugs with alcohol. It is common and can increase both immediate and long-term risks. Cocaine and alcohol, for example, are often used together, with each substance making it easier to continue using the other. Where several substances are involved, assessment needs to consider the complete pattern rather than treating each drug in isolation.
Most people who develop a drug addiction did not intend to. Use that begins recreationally, socially, or as a way of managing a difficult period can gradually shift. Tolerance builds — meaning more of the drug is needed to produce the same effect. Stopping becomes uncomfortable, or frightening, or simply feels impossible. Life starts to narrow around the drug.
Several things make addiction more likely to develop:
None of these are a cause for blame. They are factors that make it harder to stop — and understanding them is part of how treatment works.
Dependence develops when the body or mind adapts to repeated drug use and begins to rely on it. Dependence and addiction are not identical, although they often occur together.
Physical dependence means that reducing or stopping a drug produces withdrawal symptoms. The nature and severity of withdrawal depend on the substance, the amount being used, how long it has been used and whether other substances are involved. Some forms of withdrawal require medical assessment and should not be attempted without appropriate support.
Psychological dependence means feeling compelled to use a drug to manage emotions, stress, anxiety, sleep, social situations or the feeling of being unable to function normally without it. This can be powerful even where withdrawal is not medically dangerous.
Understanding the substances involved and the type of dependence that has developed is important when deciding how someone can stop safely. Read more about drug withdrawal.
Drug addiction looks different depending on the substance and the person. Some signs are visible; others are easier to hide. Common patterns include:
Not everyone will recognise all of these. Some people are aware that drug use has become a problem but find it hard to name it. Others are surprised when people close to them raise concerns. Both experiences are common.
The health risks of drug addiction depend on the substance, the pattern of use, and the person’s underlying health. Some risks are physical; others are psychological; many are both.
Physical risks include damage to the cardiovascular system, liver, kidneys and lungs. Opioids and some prescription drugs carry overdose risk. Ketamine can cause serious and sometimes irreversible bladder damage. Stimulants such as cocaine place significant strain on the heart. Injecting drugs carries additional risks including infection and bloodborne viruses.
Psychological risks include depression, anxiety, paranoia and psychosis — either caused or worsened by drug use. The relationship between drug addiction and mental health is often circular: mental health difficulties can drive drug use, and drug use worsens mental health. Where both are present, both need to be treated.
Social and practical risks include damage to relationships, difficulties at work, financial problems and legal consequences. These often compound over time and can make it harder to seek help.
Many people affected by drug addiction are also managing anxiety, depression, trauma, ADHD or other mental health difficulties. Sometimes the drug use came first; sometimes the mental health difficulty did. Often the two are so intertwined it is difficult to separate them.
This is sometimes called dual diagnosis or a co-occurring condition. Where mental health difficulties are present alongside addiction, treatment needs to address both. Treating addiction alone, without addressing what sits underneath it, is less likely to lead to lasting change.
For people with ADHD specifically, the relationship between stimulant use and self-medication is well documented. Our page on ADHD, alcohol and cocaine explores this in more detail.
Drug addiction affects more than the person using. Families often carry significant weight — worry, exhaustion, broken trust, uncertainty about what to do or say. It is common for family members to have been managing the impact of someone else's drug use for months or years before treatment becomes a possibility.
If you are supporting someone affected by drug addiction, our help for families section has information and guidance for people in that position.
Treatment depends on the substances involved, the current pattern of use, whether physical dependence has developed, what has happened during previous attempts to stop and whether mental health difficulties or alcohol use are also part of the picture.
At Abbington House, treatment takes place within one residential stay rather than through a separate drug-only programme. Assessment considers the complete situation, including the substances being used, mixed-drug use, withdrawal risks, physical and mental health, family impact and whether clinically managed detox is needed.
Where detox is required, it forms part of the residential stay. It is followed by structured therapeutic work, daily support, family involvement and preparation for returning home.
