NicotineTh2 CellsTh1 CellsNicotinic AgonistsTh17 CellsTobacco Use DisorderGanglionic StimulantsReceptors, NicotinicMecamylamineCotinineNicotinic AntagonistsChewing GumSubstance Withdrawal SyndromeTobacco Use Cessation ProductsSmoking CessationSmokingAdministration, CutaneousDihydro-beta-ErythroidineTarsSelf Administrationalpha7 Nicotinic Acetylcholine ReceptorAzocinesDose-Response Relationship, DrugAconitineTh1-Th2 BalanceConditioning, OperantRats, Sprague-DawleyQuinolizinesTobacco, SmokelessTobacco ProductsRewardTobaccoAnabasineBicyclo Compounds, HeterocyclicReinforcement (Psychology)Behavior, AnimalCarbon MonoxideSelf StimulationDopamineHexamethoniumBenzazepinesMice, Inbred C57BLTobacco Smoke PollutionBungarotoxinsHexamethonium CompoundsTime FactorsVentral Tegmental AreaQuinoxalinesAnalysis of VarianceNitrosaminesSmokeMotor ActivityPyridinesBrainNucleus Accumbens