What's the Difference Between E Cigarettes and Vapes? Grow Strong KC The impact of e cigarettes versus traditional cigarettes on long term cardiopulmonary outcomes American Journal of Physiology Heart and Circulatory Physiology American Physiological Society What Ingredients Are in E Liquids? Skyline Vape Shop Skyline Smoke Company Propylene glycol and vegetable glycerin e cigarette aerosols impact mucociliary function and cause cytotoxicity in human airway epithelium Scientific Reports Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link Alternatives to smoking Evapo