I quit, yay! I quit more than two years ago after smoking heavily for six years. Yay, I'm so proud of myself. Woohoo!
Thought I'd try and annoy the hell out of my former fellow-smokers.
Seriously though, I had heard somewhere that the difficulty of overcoming nicotine addiction is partly influenced by your genes. Maybe I was one of the lucky ones with a more benign combination, I don't know.
After I arrived at the decision to stop smoking, the first two weeks without tobacco (I used to roll my own, filterless, and really smoked rather heavily) had been the most difficult time. The physical addiction sure was noticeable. I practically spent my entire tobacco money on
Fisherman's Friend during those weeks, and my stomach sure did complain about that treatment. Some smokers can only really quit if they never come close to a cigarette again. For me, it was key not to have any tobacco around at home, but fortunately nothing beyond that. In fact, I still use to smoke whenever I go out and have some alcoholic beverage. I like that. Of course, I always have to "borrow" the cigarettes since I can't have my own around at home, you know.
Anyway, what's probably more interesting is how I summoned the courage to actually attempt quitting. I think for most people this is probably the most difficult bit. Also, I knew I would better succeed at the first try, because after experiencing failure it will only be harder next time. The story goes like this: I had fallen in love with a girl around the time, and this time around it actually worked out for a change. What followed was actually a bit of an idée fixe of mine: I spontaneously decided to put the unexpected high spirits to good use, and quit smoking. The fact that she didn't smoke also played a role of course, but she hadn't actually expressed any demands or concerns in this direction at all. As I said, it was really mainly this idée fixe to exploit my high spirits.
Well, what shall I say? It actually worked out, and I really needed only the one attempt. As to my girlfriend, we unfortunately broke up about a month ago after more than two years, but we're still on friendly terms.
However, I did not pick up the habit of smoking again.
So, I hope I didn't bore anyone to death. It would be really great if my little story may actually inspire someone to quit. The morale of the story is, wait for your next upturn in life and exploit it to quit smoking immediately! Think of all the money you save. For me, it completely financed the monthly cost of my cat.

Really, if you feel you're close to giving in again: Try to think firmly about what you're going to do with the extra money. It does help, especially since the tax is raised regularly.