Yes, there is a chemical addiction involved, but still...that guy that sat near you? He *has* to smoke (he's an addict to cigarettes). As a non-smoker, you are choosing not to smoke (you're breaking the addiction).
Yeah, I'm looking forward to when he finishes that book and has to stop, I'll have been off them for a couple of weeks by then I reckon and it'll be my turn to say crap like 'you don't really want one you just think you do'; I can't wait