Truth About E Cigarettes and Vaping: Are They Safer Than Smoking for Lung Cancer Risk? 1,2 Propylene Glycol: A Biomarker of Exposure Specific to e Cigarette Consumption Propylene glycol, a component of electronic cigarette liquid, damages epithelial cells in human small airways Respiratory Research Springer Nature Link No tobacco product is harmless according to CDC scientific evidence. E cigarette aerosol that users breathe from the device and exhale can contain harmful substances including heavy metals like lead, volatile organic compounds,
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