A drug addict's brain alters in response to the drugs he takes. There is the instant change that provides the chemical high, of course, but there are also more subtle, long-term modifications. It is these that turn a user into an addict. Some of them are responses to the drug itself. But some are responses to the circumstances in which the drug is taken. Such things as viewing the paraphernalia of drug taking, for example, serve to remind abstinent addicts of forbidden pleasures and tempt them to relapse.
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