Chronic obstructive pulmonary disease (COPD) is a chronic, progressive lung disorder characterized by persistent airflow limitation that is not fully reversible. It develops gradually, most often due to long term exposure to harmful Asthma, E cigs and Vaping: what you need to know Allergy Asthma Care and Prevention Center But I Don't Really Smoke!: E Cigarettes and Pulmonary Disease COPD Updates COPD Applied Chest Imaging Laboratory Cardiopulmonary Impact of Electronic Cigarettes and Vaping Products: A Scientific Statement From the American Heart Association Circulation