First you will be randomly assigned (like drawing out of a hat) to a study group, either the EBT or NRT group. In the extinction-based therapy (EBT) group, participants will switch to smoking denicotinized cigarettes while wearing a 21 mg/d nicotine patch for one month prior to their quit date; meanwhile, smokers assigned to the nicotine replacement therapy (NRT) group will smoke their usual brand of cigarettes up to the quit date. Following the quit date, both groups will undergo standard nicotine replacement therapy (21 mg/d for 6 weeks; 14 mg/d for 2 weeks, 7 mg/d for 2 weeks).