There is no single answer to this question as addiction can be a result of many different factors. However, some of the most common causes of drug addiction include genetic and environmental factors, as well as neurological and psychological problems.If you need more information about drug addiction you may navigate to http://stepstogether.co.uk/

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Genetic Factors

There is evidence to suggest that addiction is a hereditary condition, with genetics playing a role in who is most likely to become addicted to drugs. Studies have shown that addiction runs in families, with relatives of addicts being more likely to also become addicted themselves. This suggests that addiction may be partially caused by certain genes or chromosomes that predispose someone towards drug abuse.

Environmental Factors

Other factors that can contribute to drug addiction include exposure to drugs or alcohol during development. The environment in which someone grows up can also play a role in whether they become addicted to drugs. For example, people who grow up in environments where drugs are routinely used are more likely to develop an addiction to those substances later on in life.

Neurological and Psychological Problems

Drug addiction can also be due to underlying neurological and psychological problems. These problems can range from issues with neurotransmitters (chemicals that help nerve cells communicate) to mental health disorders such as depression or anxiety. If left untreated, these problems can lead to drug addictions. 

Overall, there is no one answer to the question of what causes drug addiction. Rather, it is likely a combination of different factors that lead to addiction.