Appalachian youth e cigarette harm perceptions and tobacco use SSPH+ What Are the Effects of Electronic Cigarettes on Lung Function Compared to Non Electronic Cigarettes? A Systematic Analysis Most common e cig refills contain respiratory irritants, and people who smoke and use e cigs are more likely to experience respiratory symptoms ERS European Respiratory Society e cigarettes: Despite ban, e cigarettes widely available at tobacco shops, sold without age verification: Survey The Economic Times