Test Kit: Propylene Glycol in Indoor Air as an Indicator of Vaping LCS Laboratory Inc. Propylene glycol and vegetable glycerin e cigarette aerosols impact mucociliary function and cause cytotoxicity in human airway epithelium Scientific Reports VG PG Ratio Explained: Choosing the Right Vape Juice for Your Kit VSAVI E Liquids Vape Kits E cigarettes can emit formaldehyde at high levels under conditions that have been reported to be non averse to users Scientific Reports