For me I quit smoking once naturally, it was more about timing, I had a fairly heavy smoking session the night before, then slept the most of the day, once I got past 24hrs I was fine, but I started about 3 months later, I quit about 4 months ago now but with the aid of champix from my gp.. they were.. odd to say the least, they made me feel sick more than make me want to stop smoking but they definitely helped. I cant use patches as they give me migraines, the tabs and gum make me sick and the inhilator thing just.. doesn't satisfy so to speak.
It all works differently for people though, but good luck with it! I still have a smoke every now and then but it's once every other month if need be but thats simply because I enjoy a smoke every now and then, though I smoke a cigar rather than a cigarette as I dont crave as much on cigars.
Good luck though!