PDF) COPD smokers who switched to e cigarettes: health outcomes at 5 year follow up E cigs: What You Need to Know if You Care for Patients with COPD Challenges in COPD Cardiopulmonary Impact of Electronic Cigarettes and Vaping Products: A Scientific Statement From the American Heart Association Circulation Can Vaping Cause Lung Cancer or Other Diseases? Essentia Health The evidence is clear: Young E cigarette users suffer from respiratory symptoms American Lung Association