Never smoked anything actually. I don't care if people want to do it, as long as they aren't endangering other people by doing so. I think they're kind of stupid for doing so, just because they are putting themselves at risk of addiction, but hey, it's a personal choice, and if they want to take that risk, it's up to them.
I wouldn't really have a problem with legalizing more drugs that are currently illegal, just so long as it would decrease (not increase) crime, and wouldn't cause more harm to other people. Heck, maybe it'd even help some of the really stupid people remove themselves from the gene pool!