I've never been a smoker, so I can't give any personal advice on how to quit smoking. I do know that quitting smoking is one of the most difficult things a person may ever have to do, and I also know that methods that worked great for some proved to be completely ineffective for others.
Here is a link to a site that offers many different ways to quit smoking, including hypnosis. I highly recommend that you look around on the site for a method that may be right for you!
Quit Smoking Web Link