I am 32 years old now, and when I was about 24, I went to a Hypnotist with my aunt so I could try to quit smoking cigarettes. The hypnosis had no effect on me. I tried, but It wasn't successful. I hear it works for some, but sadly, not me.
My aunt quit for a while after the session but then she started smoking again. It wasn't until the death of another aunt who died from smoking at the age of 54 (Damn, That's young! My Grandmother died the same way at 69 years old, and I think that that was young, too!) that she quit smoking for good..
Needless to say, I am a believer in Hypnosis but I have yet to experience it. I urge anyone who wants to stop a bad habit shout just try "Cold Turkey."