As to why I'm so interested in the topic (considering my lack of interest in actually using any legal or illegal drugs)? It's because the so-called "War on Drugs" is to American domestic policy what the "War on Terror" is to its foreign policy. I keep saying this – but imho, it can never be said too often. Until a few years ago (when I read Smoke and Mirrors: the War on Drugs and the Politics of Failure by Dan Baum), I had naively assumed it was a minor issue and I had no strong opinions on the legality or otherwise of drugs. Of course, I was willing to be persuaded that maybe marijuana should be decriminalised, but cocaine? Heroin? No way! But the more I look into the whole issue, the clearer it becomes that current policy is terribly harmful – and to a large extent politically (rather than medically) motivated. Add to this the indisputable involvement of the US government (especially the CIA) in the production and distribution of illegal drugs, and – well, it stinks.
Anyway, here's a trailer for American Drug War: