NicotineTobacco Use DisorderTobacco, SmokelessTobaccoReceptors, NicotinicNicotinic AgonistsBehavior, AddictiveSmokingSmoking CessationTobacco UsePlants, ToxicSubstance Withdrawal SyndromeTobacco IndustryNicotinic AntagonistsTobacco Use CessationSelf AdministrationSubstance-Related DisordersRewardVentral Tegmental AreaNucleus AccumbensDopamineAdministration, CutaneousTobacco Smoke PollutionReinforcement (Psychology)CotinineNitrosaminesTobacco ProductsTobacco Mosaic VirusProtein SubunitsGanglionic StimulantsLip NeoplasmsGermany, WestGyrus CinguliGenetic Predisposition to DiseaseHarm ReductionTobacco Use Cessation ProductsSwedenCross-Over StudiesMecamylaminePolymorphism, Single Nucleotide4-Nitroquinoline-1-oxideChewing GumOpioid-Related DisordersCocaineMouth NeoplasmsAdvertising as TopicImage Processing, Computer-AssistedCarcinogensMarketingUnited StatesTarsBronchitis, ChronicConditioning, OperantGingival NeoplasmsHeroin DependenceRisk FactorsPlants, Genetically ModifiedDopamine Uptake InhibitorsMotivationAlcoholismSubstance Abuse Treatment CentersLobbyingMethadoneDihydro-beta-ErythroidineSalivaBehavior, AnimalPrevalenceTaxesDose-Response Relationship, Drugalpha7 Nicotinic Acetylcholine ReceptorSmokeRats, Sprague-DawleyBrainAlkaloidsCompulsive BehaviorNarcoticsBuprenorphineDrug-Seeking BehaviorStreet DrugsCommerceCross-Sectional StudiesTime FactorsOpiumNarcotic AntagonistsCentral Nervous System StimulantsAnalgesics, OpioidPublic PolicyPublic RelationsLimbic SystemImpulsive BehaviorSocial Control PoliciesAnalysis of VarianceAzocinesQuestionnairesSocioeconomic FactorsMotor ActivityProduct PackagingCuesProduct LabelingMethamphetamine