 The goal of this proposal is to conduct an initial investigation of the efficacy of providing Yoga as an adjunct to cognitive behavioral treatment CBT for smoking cessation. Adult women smokers n72 will be recruited through newspaper advertisements and will be randomly assigned to either: 1 CBT plus Yoga , or 2 CBT plus contact control. All study participants will be given a sub-maximal exercise stress test to ensure that they are safe to exercise. Yoga sessions will be conducted twice weekly for 12 weeks, and will be lead by certified instructors in yoga. Smoking cessation sessions will be conducted once per week for 12 weeks and will be lead by Masters or PhD level specialists in smoking cessation. Differences in post-treatment 12 week cessation rates 7-day point prevalence abstinence will provide data for estimates of effect size between conditions. This effect size estimate is necessary in order to calculate power estimates for a major clinical trial. 