That's the problem with drugs. I'm totally against them (all drugs, including booze and tobacco, which is definitely one of the most addicting and dangerous one, but it's another debate) but when I hear those guys talking about their trips, I wish I could try one but without the addiction and the side effects. Vai wrote a song about a bad trip he had (somebody slipped a pill in his drink, that's what he says, but I guess he was curious, just like me)and several Hendrix's effects were inspired by what he heard in those trips, and he tried to recreate them when he was clean...