I smoke, I'm trying to quit though.
People that insist on annoy people that smoke, as if those people are somehow unaware of the fact that it's bad for them, annoy me greatly though. If someone is smoking near you and you find it unpleasent, it's fine to say something. However, some people seem to feel the need to go out of their way to harrass smokers for their habit.
I find overweight people somewhat repulsive, much as I imagine some people dislike smokers. However, I don't constantly pester them, informing them of bad habit, nor do I exhibit disgust when they go for their 6th pie of the day. People have vices, and it's their decision for good or ill.