Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link Vegetable Glycerine & Propylene Glycol DIY Liquid Mixing Base VG PG eBay E Cigarettes and Vaping PPAC Central DIY PGVG base
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propylene glycol in vapes Propylene Glycol vs. Vegetable Glycerin: A guide for vapers and vaping