As well as being exceptionally well written (so much so that you almost want to keep reading solely for the writing), Allen Carr's Easy Way To Quit Smoking is very effective at its aim.
First it makes you realise how unexciting smoking is, and how unnecessary, and then gives that beautiful nudge to just quit. Just like that. I threw out my half pack of tobacco nearly three weeks ago and I haven't spiraled into mania. I didn't even produce a sweat of anxiety. I just stopped.
I don't crave cigarettes, although I do think about them. Not so much because I miss them, but because I had built a decade-long habit around it. How am I not going to think about them? And, besides, Allen stipulates that you must allow yourself to freely think about smoking if your mind wishes to. Don't NOT think about it!
Anyway, I highly recommend this book for smokers who feel they must quit, especially if you have tried every other method of quitting.
In a nutshell, from personal experience, the thing about quitting smoking is that you just have to not smoke. The hardest part is overcoming the withdrawals (which I never really noticed them) and putting yourself in the right frame of mind. Allen's Easy Way does this exceptionally well. And (bonus points!) it is written so fabulously, so engagingly, that it's a breeze to get through.