Heroin DependenceAdministration, InhalationInhalation ExposureSmoke Inhalation InjuryBurns, InhalationNarcoticsInhalationMorphine DerivativesMethadoneAerosolsSelf AdministrationAnesthetics, InhalationBuprenorphineAnesthesia, InhalationDrug OverdosePowdersLungCodeineStreet DrugsCocaine-Related DisordersSubstance Abuse, IntravenousBronchial Provocation TestsSubstance Abuse DetectionBehavior, AddictiveOpioid-Related DisordersAsthmaSubstance Withdrawal SyndromeDose-Response Relationship, DrugAtmosphere Exposure ChambersDrug and Narcotic ControlBronchodilator AgentsAlbuterolMorphineNaloxoneSubstance-Related DisordersOpiate Substitution TreatmentRats, Inbred F344NaltrexoneCocaineDry Powder InhalersAir Pollutants, OccupationalParticle SizeReceptors, Opioid, muXenon RadioisotopesInhalation SpacersTime FactorsBronchoalveolar Lavage FluidForced Expiratory VolumeMethacholine ChlorideAnalgesics, OpioidDrug UsersAirway ResistanceAnthraxBronchoconstrictionAir PollutantsRespirationBurnsMetered Dose InhalersCarboxyhemoglobinBronchiSmokeConditioning, OperantBronchial HyperreactivityRespiratory Function TestsIsocyanatesRespiratory TherapyCrimeDustGas Chromatography-Mass SpectrometryTrichloroethanesOccupational ExposureNitrous OxideCromolyn SodiumOxygen RadioisotopesBronchoconstrictor AgentsOxygen Inhalation TherapyNucleus AccumbensRespiratory SystemPlutoniumReinforcement (Psychology)Carbon DioxideSubstance Abuse Treatment CentersInjections, IntravenousIpratropiumBudesonideBehavior, AnimalVehicle EmissionsVolatilizationGasesCyanatesDisease Models, AnimalIsofluraneBody BurdenLaw EnforcementHydrocarbonsTerbutalineReinforcement ScheduleCross-Over StudiesCarbon MonoxidePneumonia