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Pulmonary Disease, Chronic ObstructiveLung Diseases, ObstructiveForced Expiratory VolumeTobaccoSpirometryBronchodilator AgentsRespiratory Function TestsDyspneaVital CapacitySmokingPulmonary EmphysemaScopolamine DerivativesLungAdministration, InhalationOxygen Inhalation TherapyExercise ToleranceSeverity of Illness IndexSputumCholinergic AntagonistsEmphysemaIpratropiumSleep Apnea, ObstructiveRespiratory MusclesAlbuterolSmokeAdrenal Cortex HormonesAsthmaBronchitis, ChronicRespiratory InsufficiencyTobacco IndustryAdrenergic beta-2 Receptor AgonistsQuality of LifeBronchiPulmonary MedicineRespiratory System AgentsInspiratory CapacityTreatment OutcomeLung DiseasesCase-Control StudiesTobacco, SmokelessRisk FactorsExpectorantsRespiratory TherapyTobacco Smoke PollutionBronchitisNebulizers and VaporizersRespiratory Mucosaalpha 1-Antitrypsin DeficiencyProspective StudiesPneumoniaInhalationPositive-Pressure RespirationHypercapniaBreathing ExercisesQuestionnairesHospitalizationOxygenExercise TestTobacco Use DisorderBlood Gas AnalysisWork of BreathingTime FactorsRespiratory MechanicsSmoking CessationRespiration, ArtificialBronchoalveolar Lavage FluidDisease ProgressionAirway ObstructionNoninvasive VentilationCross-Sectional StudiesPrevalenceHome Care Services, Hospital-BasedMetered Dose InhalersComorbidityDouble-Blind MethodPhosphodiesterase 4 InhibitorsLung Volume MeasurementsRetrospective StudiesHeliumChronic DiseaseExercise TherapyPulmonary Gas ExchangeAirway ResistanceExhalationEthanolaminesBronchoscopyRespiratory SystemTobacco Use CessationAcute DiseaseCohort StudiesTobacco ProductsBiological MarkersPulmonary VentilationDiaphragmGlycopyrrolateTotal Lung CapacityCarbon DioxideInflammationRisk AssessmentJaundice, Obstructive