A new study published in Nicotine & Tobacco Research found that those using e cigarettes alone were more than twice as likely to develop COPD than people who didn't use any tobacco products, What are the symptoms of vaping illness? Doctors warn about e cigarettes Vaping Tied to Bronchitis, Dyspnea Risk in Young Adults RT E Cigarettes and Cardiopulmonary Health: Review for Clinicians Circulation Tobacco Smoke, Vaping, and Asthma AAFA.org Chronic Bronchitis American Lung Association