Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link Toxicity of humectants propylene glycol and vegetable glycerin in electronic nicotine delivery systems ScienceDirect Understanding Propylene Glycol in Vapes and Formaldehyde E Cigarettes and Vaping PPAC Central
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propylene glycol in vapes Propylene Glycol and Vegetable Glycerin 2-Pack: one PG and one VG, 500 mL (1.06 Pint) Each with Dispensing Caps; USP, Food-Grade, Kosher: Amazon.com: Industrial & Scientific