National Emphysema Foundation E cigarettes are Poor Substitutes for Conventional Smoking in COPD Patients Project Filter Secondhand Vape Informational Poster #1 Idaho Health Tools Elevated risk of developing COPD with e cigarette use: Study COPD Patients Who Switch From Smoking to Vaping See Long Term Benefits National Emphysema Foundation E cigarettes and Vaping Just As Bad On Lung Health As Cigarettes Vaping and COPD