I know people who have smoked for a number of years and haven't gotten lung cancer, which makes anyone who says differently a tin-foil hat-wearing conspiracy theorist.
My father smoked for > 20 years (then quit) and hasn't gotten cancer. I guess that proves cigarettes don't cause cancer!
Not really, but it does prove it is a filthy nasty habit; and as long as people keep it to themselves, that is fine; but remember their rights END where mine begin. I could care less if it can cause me harm or not, I don't like the hideous smell it permeates clothes and other things with.