I have a fun experience with the Alan Carr book. The first time I read it, I was laughing the whole way through thinking about how much it was written like straight-up brainwashing propaganda, but I had committed to a friend to reading it all the way through. I got to the end where the final bit is something like "now just say out loud 'I am a non-smoker and when I wake up tomorrow I will never have a cigarette again'". I chuckled, thought it was ridiculous, and the next morning I woke up and didn't have a smoke. That lasted about 2 years until I got extremely drunk one night after a rough breakup, had smoked the whole night, and was pretty much instantly hooked again.

Ten years later I went through the exercise again, but sadly it didn't work nearly as well as it had the first time around.

One thing that kind of opened my eyes is his asking the reader "what do you prefer about your cigarette brand?" It made me realize that they all taste like sh*t.