1,2 Propylene Glycol: A Biomarker of Exposure Specific to e Cigarette Consumption Do Vapes Have Sugar? The Truth About Sweeteners and Vaping PG and VG are two common base ingredients in e liquids for electronic cigarettes, playing crucial roles in various vaping products. Let's explain their meanings using simple and understandable Ge Gou E cigarettes can emit formaldehyde at high levels under conditions that have been reported to be non averse to users Scientific Reports 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