I gave up like about 12 years ago, but I was never much of a smoker any way, about half a pack a day at the most (I even use too just smoke half a ciggie & stub it out & smoke the rest of it later. Even after I gave up I would still smoke the occasional one when someone offered me one in the pub (so I used to say I just gave up buying them). But for about the last 8 years or more I havent smoked at all. Sometimes after retirerring to the lounge room after dinner I may still get that funny urge to light up, or when I'm in the pub, too. But I just ignore it to the point that that urge is prtty rare these days.
Really its not hard too stop (well for me it was the money issue - I hate spending it, I spose it helps if one is a tightwad), its just a matter of having the right frame of mind.