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Public opinion can support or sap the effectiveness of a good policy for prevention. For example, the widely spread use of tobacco in almost all the societies makes this type of behavior look close, easy and normal to most people. Alcohol has been accepted in the society in the same way. And this all makes business of producers of these legal narcotics very easy and they have the right to advertise their products and sell them freely everywhere to everybody.
The priority in changing public opinion must be not only to inform the population about the problems drugs cause, but also about the methods of prevention the officials use. Intentions to execute new laws and other prevention often provoke debates, which can be after all more important for the society than the executed measures.
On the other hand, lack of knowledge about illegal drugs leads to creation of extremes in people's attitude to them.