My problem with hypnotherapy is that it can get quit expensive since you usually have to go for multiple sessions.
I'm currently on day 4 using a 'Quit Smoking' MP3 Hypnosis soundtrack and I have already cut my cigarettes per day down to half. I paid $25 for it, downloaded it, started immediately and I can listen to it as often as I want. Since it's working so well already, I'm very confident I'll quit smoking altogether within a few weeks.
The site I downloaded the 'Quit Smoking' MP3 from also has one for weight loss and as soon as I've quit smoking, I'm going to download the "Lose Weight' MP3.
I can't wait to get started, and what have I got to lose besides the weight ...$25? Well worth it if you ask me.