NicotineUrineNicotinic AgonistsTobacco Use DisorderGanglionic StimulantsReceptors, NicotinicCotinineMecamylamineNicotinic AntagonistsChewing GumSubstance Withdrawal SyndromeTobacco Use Cessation ProductsSmokingSmoking CessationAdministration, CutaneousDihydro-beta-ErythroidineTarsUrinalysisSelf Administrationalpha7 Nicotinic Acetylcholine ReceptorAzocinesDose-Response Relationship, DrugRats, Sprague-DawleyAconitineUrine Specimen CollectionConditioning, OperantSubstance Abuse DetectionTobacco, SmokelessQuinolizinesTobacco ProductsAnabasineRewardTime FactorsTobaccoChromatography, High Pressure LiquidBicyclo Compounds, HeterocyclicReinforcement (Psychology)Behavior, AnimalCarbon MonoxideBacteriuriaDopamineTobacco Smoke PollutionSelf StimulationBenzazepinesHexamethoniumAnalysis of VarianceBungarotoxinsQuinoxalinesHexamethonium CompoundsPyridinesBiological MarkersVentral Tegmental AreaSmokeNitrosaminesGlucuronatesBrainMotor ActivityCreatinineRats, WistarPrenatal Exposure Delayed Effects