Comparative study of lung toxicity of E cigarette ingredients to investigate E cigarette or vaping product associated lung injury ScienceDirect PG vs. VG: What's the Difference? What Are the Ingredients in Vape Juice? Toxicity of humectants propylene glycol and vegetable glycerin in electronic nicotine delivery systems ScienceDirect
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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