Electronic cigarettes and cardiovascular disease: epidemiological and biological links Pflgers Archiv European Journal of Physiology Springer Nature Link E cigarettes are more harmful smokers Emerging medical research continues to examine the respiratory risks associated with flavored e cigarettes, including concerns about bronchiolitis obliteransoften referred to as popcorn lung. The condition involves inflammation and scarring of the Immunological Effects of Electronic Cigarette Use: A Review of Current Evidence Clinical Reviews in Allergy & Immunology Springer Nature Link