Two studies were done in which the subjects applied punishment contingencies to themselves for smoking cigarettes. After Baseline in Experiment I, the subject set a limit of 15 cigarettes for himself. If he exceeded the level, he was to tear a dollar bill into pieces for every additional cigarette he smoked. Every five days the criterion was decreased by one cigarette. After 50 days the subject ceased smoking entirely and had not started to smoke again two years after the study was completed. In Experiment II a teacher decreased her smoking rate by contributing 25 cents to charity for each cigarette she smoked and made further gains when she added the condition of not purchasing cigarettes. When Baseline conditions were reinstated, the smoking rate increased, but again diminished when she used a procedure of not buying cigarettes. One year after the study ended she was smoking only in stressful situations. (Author)