1,2 Propylene Glycol: A Biomarker of Exposure Specific to e Cigarette Consumption Liquid E Cigarettes Liquid nicotine used in e cigarettes still a danger to children despite recent decline in exposures Vaping can silently destroy your body, damaging multiple organs without you realizing it. Each puff delivers a mix of nicotine, propylene glycol, glycerin, heavy metals, and flavoring chemicals that slowly corrode your 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