Vaping aerosols contain thousands of unknown chemicals and substances not disclosed by manufacturers, including industrial chemicals and caffeine, Johns Hopkins University researchers found. : r/science

Baltimore Fishbowl Electronic cigarettes contain thousands of unknown chemicals, Johns Hopkins researchers find

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Teens using e-cigarettes show evidence of same toxic chemicals as smokers: Study - ABC News

Nearly 2,000 unknown chemicals found in vape liquids and e-cig aerosols

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Comparison of the chemical composition of aerosols from heated tobacco products, electronic cigarettes and tobacco cigarettes and their toxic impacts on the human bronchial epithelial BEAS-2B cells - ScienceDirect

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Characterizing the Chemical Landscape in Commercial E-Cigarette Liquids and Aerosols by Liquid Chromatography–High-Resolution Mass Spectrometry

Many e-cigarette vaping liquids contain toxic chemicals: new Australian research : r/australia

Public Health Consequences of E-Cigarettes, PDF, Electronic Cigarette

Johns Hopkins researchers find thousands of unknown chemicals in electronic cigarettes