E Cigarettes The emerging threat!!! Propylene glycol and vegetable glycerin e cigarette aerosols impact mucociliary function and cause cytotoxicity in human airway epithelium Scientific Reports Health Effects of E Cigarettes Kansas Health Institute E cigarettes can emit formaldehyde at high levels under conditions that have been reported to be non averse to users Scientific Reports E liquide cigarette elecronique sans propylene glycol Vegetol Pure