RecruitingClinical trialLittle Cigar OxidantsDetermine the effects of little cigars on human exposure to tobacco smoke oxidants. In a balanced randomized cross-over study design in cigarette smokers, subjects will be assigned to 3 exposure groups. These include a high oxidant little cigar exposure condition, a low oxidant little cigar exposure condition, and their usual cigarette. Biological samples will be collected before and after product usage.