65 habitual smokers were randomly assigned to one of 4 groups: live-hypnosis plus counseling, videotape-hypnosis plus counseling, relaxation-hypnosis plus counseling, and counseling alone. The content and mode of presentation of the hypnosis session varied among the first 3 groups. At 6 montiis posttreatment, die live-hypnosis plus counseling group contained significantly more abstainers than die other 3 groups. The importance of the specific content of the hypnosis session and die presence of the hypnotherapist for die effectiveness of the procedure is discussed.
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Pederson et al. (1979) studied this question.