Smoking CessationWork of BreathingRespirationMouth BreathingRespiratory MechanicsTobacco Use CessationBreathing ExercisesTobacco Use Cessation ProductsSleep Apnea SyndromesTidal VolumeSmokingPulmonary VentilationBupropionInhalationApneaTobacco Use DisorderCarbon DioxideRespiratory Physiological PhenomenaPolysomnographyOxygenIntermittent Positive-Pressure BreathingRespiratory RateRespiratory MusclesDiaphragmAirway ResistanceNicotineHeliumExhalationSnoringAnoxiaRespiratory CenterHyperventilationRespiratory Function TestsTime FactorsSleep Apnea, CentralNicotinic AgonistsChemoreceptor CellsVentilator WeaningAirSleep Apnea, ObstructivePulmonary Gas ExchangeRespiration, ArtificialBlood Gas AnalysisFetal MovementSleepLungCheyne-Stokes RespirationPlethysmographyPlethysmography, Whole BodyAir PressureLung Volume MeasurementsHotlinesAirway ObstructionRespiratory InsufficiencyRespiration DisordersPartial PressureThoraxPositive-Pressure RespirationPeriodicityMotivationHeart RateTreatment OutcomeSleep StagesOximetryPhrenic NerveRespiratory Dead SpaceWakefulnessDecompression SicknessIntercostal MusclesRespiratory SystemOxygen ConsumptionChewing GumOxygen Inhalation TherapyElectromyographyRespiratory TherapyHypoventilationHyperoxiaFunctional Residual CapacitySpirometryRespiratory Protective DevicesFollow-Up StudiesLung ComplianceAdenoidectomyLung Diseases, ObstructiveSubstance Withdrawal SyndromeAerosolsBenzazepinesQuinoxalinesQuestionnairesRespiratory-Gated Imaging TechniquesDirective CounselingAdministration, InhalationThoracic WallTonsillectomyAdministration, CutaneousAbdominal MusclesInspiratory CapacityMedulla OblongataVagotomyMasks