Quitting smoking sucks. I smoked 2 packs a day and quit cold turkey. After numerous tries, it finally took pride to get me to quit. My buddies told me there was no way I'd ever succeed, since I never had in the past.
The resolve to prove them wrong was enough. That was 10 years ago. The key for me was to just do it one day at a time. Every day I'd decide I couldn't do it, so I'd promise myself I'd start back tomorrow, but I HAD to finish today smoke free. Just the thought of having that cig "tomorrow", got me through "today". Then I'd do it all over again.