Smoking Status and COPD Symptoms and Prognosis Journal of the COPD Foundation Electronic cigarette use and its association with asthma chronic obstructive pulmonary disease (COPD) and asthma COPD overlap sy Analysis underscores the health risks of e cigarettes Pulmonary Frontiers More to Explore: Further Definition of Risk Factors for COPD Differential Gender Difference, Modest Elevation in PM2.5, and e Cigarette Use E Cigarettes Have No Benefit for COPD Patients Trying to Quit Smoking Vaping and Electronic Cigarette Toxicity Overview and Recommendations (Project VECTOR) Intrepid Lab