Electronic cigarette use and its association with asthma, chronic obstructive pulmonary disease (COPD) and asthma COPD overlap syndrome among never cigarette smokers Electronic Cigarette Use in US Adults at Risk for or with COPD: Analysis from Two Observational Cohorts Journal of General Internal Medicine Springer Nature Link Exclusive E cigarette Use Significantly Associated with COPD RT E Cigarettes Have No Benefit for COPD Patients Trying to Quit Smoking Research Links E Cigarettes to COPD and Hypertension Technology Networks