In a meta-analysis of 59 studies hypnosis was judged to be partially efficacious in the treatment of smoking cessation. - GreenMedInfo Summary

This article reviews 59 studies of hypnosis and smoking cessation as to whether the research empirically supports hypnosis as a treatment. Whereas hypnotic procedures generally yield higher rates of abstinence relative to wait-list and no-treatment conditions, hypnotic interventions are generally comparable to a variety of nonhypnotic treatments. The evidence for whether hypnosis yields outcomes superior to placebos is mixed. In short, hypnosis cannot be considered a specific and efficacious treatment for smoking cessation. Furthermore, in many cases, it is impossible to rule out cognitive/behavioral and educational interventions as the source of positive treatment gains associated with hypnotic treatments. Hypnosis cannot, as yet, be regarded as a well-established treatment for smoking cessation. Nevertheless, it seems justified to classify hypnosis as a "possibly efficacious" treatment for smoking cessation.