Each session will last approximately 6.5 hours and will correspond to a specific transdermal patch dose (0, 7, 14, or 21 mg). Objectively verified cigarette abstinence will be required before each session. Sessions will occur at least 48 hours apart to avoid carryover. Cognitive, behavioral, subjective, and physiological measures will occur during study visits. Specifically, the NRT dose response to tobacco suppression and cigarette blunting effects will be compared in women and men.