MecamylamineNicotinic AntagonistsNicotineNicotinic AgonistsReceptors, NicotinicDihydro-beta-ErythroidineChlorisondamineGanglionic BlockersAzocinesDimethylphenylpiperazinium IodidePempidineCholinergic AntagonistsHexamethonium CompoundsAconitineQuinolizinesGanglionic StimulantsScopolamine HydrobromideAcetylcholinePentolinium TartrateMuscarinic AntagonistsCholinergic AgentsAtropineHexamethoniumDose-Response Relationship, Drugalpha7 Nicotinic Acetylcholine ReceptorPhysostigmineDecamethonium CompoundsBicyclo Compounds, HeterocyclicSubstance Withdrawal SyndromeTubocurarinePharmacologyParasympathomimeticsBungarotoxinsTobacco Use DisorderRats, Sprague-DawleyNeostigmineCholinergic AgonistsMethyltyrosinesSelf StimulationCarotid BodyStereoisomerismMuscarinic AgonistsOxotremorineReceptors, Muscarinic