NicotineNicotinic AgonistsTobacco Use DisorderGanglionic StimulantsReceptors, NicotinicMecamylamineCotinineNicotinic AntagonistsChewing GumSubstance Withdrawal SyndromeSmoking CessationTobacco Use Cessation ProductsSmokingAdministration, CutaneousDihydro-beta-ErythroidineBiological ProductsTarsSelf Administrationalpha7 Nicotinic Acetylcholine ReceptorMolecular Sequence DataAzocinesDose-Response Relationship, DrugTobacco ProductsTobacco, SmokelessBase SequenceRats, Sprague-DawleyAconitineConditioning, OperantAmino Acid SequenceConsumer Product SafetyTobaccoQuinolizinesDairy ProductsRewardTime FactorsProduct LabelingCarbon MonoxideAnabasineBicyclo Compounds, HeterocyclicReinforcement (Psychology)Behavior, AnimalSelf StimulationCloning, MolecularHexamethoniumDopamineChromatography, High Pressure LiquidGlycosylation End Products, AdvancedKineticsBenzazepinesEscherichia coliTobacco Smoke PollutionNitrosaminesBungarotoxinsBrainAnalysis of VarianceHexamethonium CompoundsQuinoxalinesSmokeVentral Tegmental AreaPyridinesRNA, MessengerAlkaloidsMeat ProductsPlants, ToxicMotor ActivityMutationStereoisomerismNucleus Accumbens