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Aerosol Not Harmless <br />Aerosol vehicle, humectant <br />•mainly propylene glycol, which can lead to acute eye and lung irritation and is a known asthma trigger, and some vegetable glycerin <br />Nicotine (available without) <br />•delivered at varying concentrations and doses, depending on device and its operation; level not yet regulated <br />Flavors <br />•some with known toxicity <br />Plus other contaminants with known and unknown potential risks (e.g., ultrafine particles) <br /> <br /> References: Schripp et al., 2012; CDC Grand Rounds: E-cigarettes: An Emerging Public <br />Health Challenges. 10/20/2015 (Presentation).; Wieslander, G., et al. (2001). Occup <br />Enviorn Med.