COPD is a progressive, largely irreversible airflow limitation characterized by chronic cough, sputum production, and dyspneamost commonly due to smoking. Spirometry (FEV FVC < 0.7) confirms diagnosis; smoking cessation is the most effective National Emphysema Foundation E cigarettes and Vaping Just As Bad On Lung Health As Cigarettes Chronic Bronchitis: A Review Journal of the COPD Foundation Vaping' Increases Odds of Asthma and COPD Johns Hopkins Medicine Biological and Genetic Mechanisms of COPD Encyclopedia MDPI
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