Good luck!
I stopped smoking after 13 years, cold turkey (good practice at the stubbornness required for IM!). Developed an alarming but temporary addiction to macadamia nuts (as the hand to mouth action had become so second nature...) and found that the thing that helped me with cravings was pretending to smoke! As in raising my hand to my lips and taking a deep breath, holding it and exhaling it slowly. After 13 years that action had been what I'd done every time I was stressed, or needed to think, or needed a break at work, so I carried on doing it, but just without a cigarette in my hand. Oddly enough, I found that the odd deep breath calmed me nearly as much as a ciggie.
Added up the amount of money I was saving (ignoring the fact that macadamia nuts are nearly as expensive as fags) and treated myself to random antiques on ebay).
Had my last cigarrette over six years ago. Don't miss the annual bout of bronchitis, that's for sure! 