When I talk about drugs I mean joints, XTC, and stuff like that, so in that perspective I don't do drugs. I never have, and probably never will (yes, I said probably, that's because I also said I wouldn't smoke, but drugs is a completely different subject in my mind). I do drink however, not much, never got drunk (got close to it once or twice though, but I knew at that point I should stop going any further), and I do smoke since 4 months ago, but moderate. I try to enjoy it without getting addicted...
And I don't know how I would react when my children were doing drugs. I would try my best to teach them not to use it, but I'm not ignorant, they'll probably experiment if they had the chance, the only thing I can do at that point is make sure they know their limits, and don't underestimate it...