The W.H.O. does not say anything about using hypnosis to quit smoking. As the World Health Organization is the only source of truth for QuitNow, we cannot give you a medically based opinion. What we can tell you is that if they do not recommend it, you are better off doing something they do recommend. For example, they say that chewing nicotine gums and using transdermal patches is a good way to fight cravings.