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Toxicity of humectants propylene glycol and vegetable glycerin in electronic nicotine delivery systems ScienceDirect PG VG Propylene Glycol USP Grade PG for Ejuice Central Vapors Determination of 1,2 Propylene Glycol and Glycerol in Tobacco and Tobacco Products by Gas Chromatography CORESTA PG vs VG: Propylene Glycol and Vegetable Glycerin Vaping: An Attack on Your Immune System NC DNA Day Blog 1,2 Propylene Glycol: A Biomarker of Exposure Specific to e Cigarette Consumption
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