Propylene glycol in e cigarettes might keep us healthy, says researchers 180 Propylene Glycol Stock Photos, High Res Pictures, and Images Getty Images Anti freeze, Antifreeze, Parabens 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 Tobacco Truth: E Cigarettes No Toxic Effects from Inhaled Propylene Glycol Aerosol Mitigating the Youth Vaping Epidemic Through Health Education Talia Sager, Maureen Meister, Xiaojia He, Christa Wright, 2025 Do you know what you're vaping? Propylene glycol (PG) and vegetable glycerin (VG) are the main liquids in vapes. When heated, these chemicals turn toxic and aren't safe to breathe.