NicotineNicotinic AntagonistsMecamylamineNicotinic AgonistsReceptors, NicotinicDihydro-beta-ErythroidineGanglionic StimulantsHexamethoniumAconitineChlorisondamineTubocurarineParasympathomimeticsIbogaineErabutoxinsAzocinesMuscarinic AntagonistsBungarotoxinsAcetylcholineConotoxinsHexamethonium CompoundsGanglionic BlockersCholinergic Antagonistsalpha7 Nicotinic Acetylcholine ReceptorQuinolizinesPhysostigmineScopolamine HydrobromideBicyclo Compounds, HeterocyclicTobacco Use DisorderDose-Response Relationship, DrugReceptors, MuscarinicRats, Sprague-DawleyAtropineCholinergic AgonistsSelf AdministrationReceptors, CholinergicPyridinesCarbacholCotinineNeuronsSynaptic TransmissionHormone AntagonistsElectric StimulationDopamine AntagonistsExcitatory Amino Acid AntagonistsSubstance Withdrawal SyndromeMembrane PotentialsChewing GumNarcotic AntagonistsNeurokinin-1 Receptor AntagonistsAction PotentialsTobacco Use Cessation ProductsHistamine H2 AntagonistsSmoking CessationSmokingInterleukin 1 Receptor Antagonist ProteinPiperidinesGABA AntagonistsAdministration, CutaneousHistamine H1 AntagonistsPurinergic P1 Receptor AntagonistsHistamine AntagonistsRats, WistarAdrenergic alpha-1 Receptor AntagonistsAdenosine A2 Receptor AntagonistsBenzazepinesPurinergic P2 Receptor AntagonistsTarsSerotonin 5-HT2 Receptor AntagonistsSerotonin 5-HT3 Receptor AntagonistsBehavior, AnimalAdenosine A1 Receptor AntagonistsQuinoxalinesDrug InteractionsLeukotriene AntagonistsConditioning, OperantAngiotensin Receptor AntagonistsAdrenergic alpha-2 Receptor AntagonistsGABA-A Receptor AntagonistsTime FactorsAdrenergic alpha-AntagonistsDopamineRadioligand AssayAdrenergic AntagonistsHistamine H3 AntagonistsReceptors, N-Methyl-D-AspartateBinding, CompetitiveMotor ActivityDizocilpine MaleateReceptors, SerotoninGuinea PigsAnalysis of VarianceBrainCalcium Channel BlockersRewardNaltrexoneReceptors, EndothelinSerotonin 5-HT1 Receptor AntagonistsAdrenergic beta-2 Receptor AntagonistsCells, CulturedMice, Inbred C57BL