PG Propylene Glycol vs VG Vegetable Glycerin All you need to know The Role of ROS in Electronic Cigarette and Heated Tobacco Product Induced Damage 10ml Th Menthe Arme concentr VDLV Vaping Equals 1,2 Propylene Glycol: A Biomarker of Exposure Specific to e Cigarette Consumption Researchers at the University of California, Riverside, found that heating propylene glycol, the main ingredient in most e cigarette liquids, can produce two toxic chemicals, methylglyoxal and acetaldehyde, which damage lung cells. Using