This legalization talk is flawed. Alcohol is legal, and that doesn't stop people, specially teenagers, from abusing it. It's also proven tobacco addiction starts during adolescence. In this case, legalization is just removing responsibility from the people who profit from it, since in practice the law isn't protecting who it's supposed to protect. Just because something is legal doesn't make it ethical. Then, we know…
The big question to me, is what causes more harm: drug use, or the criminals that it funds? I'd wager the latter; drug use can be dealt with as a medical problem (I'm living proof) to some extent, murderous cartels, warlords, and corruption around the world can't be.
Something to think about anyway!