Well, let's put it like "I feel like it". Not because I'm bored, or because I want things to be better, or even forget about my "problems". I know a shitload of people do drugs because of those kind of things, and that's what leads them to addiction, to them having to be high on it.
I can enjoy the same things I do while I'm high, in the same way I enjoy them differently when I'm not. It's just a matter of "spicing things up" every once in a while.
I do smoke when I'm with my friends, and there's where my friend (which I mentioned >>120
) that's become an addict is, it's really noticeable because they can't tell the effects it has on them (memory, cognitive, they don't have control over themselves, etc), it's because people like them drugs are seen as a bad thing. I guess its kinda easy to see things the way you're seeing them, because you've been taught its something that's really bad, and they are, if you get addicted on them, but the same thing happens with food, alcohol, drugs (medicines), tobacco, etc.