I have been teaching in secondary education for 15 years and have seen some of my students get involved in drugs. Many stay in control. Some do not. Two come to mind who have every opportunity in life - good parents, families who are supportive, they were good kids. But they got addicted and got into crime and, while on the drugs are not human. They do not think for themselves, they just let the drug control them. They have had help but do not seem to be interested in changing anything. I agree with Reynolds here - getting into drugs does waste a lot of public resources. It's not just luck and a nice life that keeps the majority of drugs.