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Here you will understand what governments and other organizations around the world do and how. These are the basic principles for these programs.
Here are some programs, which are currently in progress in the USA.
You may also read about the "International Day against Drug Abuse and Illicit Drug Trafficking" of the UN.
STRATEGIES FOR PREVENTIONS
There are many articles in literature about the effect of many strategies for prevention. They show us which strategies in what conditions can work well and which not. But they have also two very important disadvantages. First, they are based on the experience of only few well-developed countries and can't be applied in other societies. Second, the short-term effects of the strategies described are well evaluated, but the long-term ones aren't. But, after all the short-term effects are very important for evaluation of the strategy by the society.
A good strategy for prevention includes many others and their good effects can be achieved only if they are well combined. Here is the way they are evaluated.