The Church of Scientology has long been a leading anti-drug force in the world. It reaches more people with its drug-free life message than even governments. Last year alone the Church's campaign brought the anti-drug message to close to 50 million people. And all this is financed by Church members.
Here is an article with more data and statistics on the effectiveness of the campaign: Scientology President Calls On Religions To Unite To Eradicate Drug Pandemic