First of all, you need to have a firm will to implement your decision to quit drugs. And you need to have people around you to help you go through that process, since it is not easy.
Your friends and family are the most important factor (besides yourself, of course). The biggest problem is a danger of a relapse.
This is something where a drug rehab center can help you; they teach you how to prevent relapses. You need to know how to utilize your time when you are not on drugs. Social and recreational activities, and expressing yourself through art or sports, are some ways of dealing with relapse problem.
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