NicotineSmokingNicotinic AgonistsTobacco Use DisorderSmoking CessationGanglionic StimulantsCotinineReceptors, NicotinicMecamylamineTobacco Use Cessation ProductsChewing GumSubstance Withdrawal SyndromeTarsNicotinic AntagonistsAdministration, CutaneousTobacco ProductsTobacco Smoke PollutionDihydro-beta-ErythroidineTobacco, SmokelessTobaccoSelf Administrationalpha7 Nicotinic Acetylcholine ReceptorSmokeAzocinesCarbon MonoxideMotivationDose-Response Relationship, DrugMentholNitrosaminesCarboxyhemoglobinRisk FactorsHotlinesPlants, ToxicConditioning, OperantAconitineTime FactorsQuinolizinesRewardTobacco IndustryLung NeoplasmsBenzazepinesQuestionnairesProduct LabelingRats, Sprague-DawleyAnalysis of VarianceTobacco Use CessationQuinoxalinesReinforcement (Psychology)BupropionAnabasineBicyclo Compounds, HeterocyclicCase-Control StudiesPulmonary Disease, Chronic ObstructiveCounselingBehavior, AnimalSelf StimulationCross-Sectional StudiesPyridinesAdvertising as TopicDopamineHexamethoniumSex FactorsCuesAge FactorsDouble-Blind MethodPrevalenceIntentionBungarotoxinsAryl Hydrocarbon HydroxylasesHexamethonium CompoundsSalivaMotor ActivityBrainVentral Tegmental AreaPrenatal Exposure Delayed EffectsLogistic ModelsMarketingAffectForced Expiratory VolumeNucleus Accumbens