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Genes and addiction

The brain chemical dopamine seems to be associated with so-called 'pleasure-seeking behaviour'. Scientists have found variant genes in some alcoholics and heroin addicts that may affect the dopamine levels in their brains. These variants may predispose some people to addictive behaviour, but it does not mean that these people are destined to become alcoholics or heroin addicts - they still have control over what they do.

Certain gene variants may predispose some people to addictive behaviour.
Certain gene variants may predispose some people to addictive behaviour.
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