You're forgetting the fact some of them made the conscious decision to start smoking. You might just be missing the chance to get to know someone who you might actually like.
Yeah I'm sure some of them did, but a lot of them it comes from peer pressure or the fact that their parents did or whatever, well, from around my area anyways, can't speak for the whole world of course
. And anyway, I do have friends that smoke, it's not that I avoid all smokers, I mean my dad smokes, it's just that I hate it, would never do it myself and certainly would never get into a relationship with someone that did.