"What we do know is in e-cigs is not reassuring. Multiple studies have found chemicals like acetaldehyde, formaldehyde, and toluene, as well as heavy metals like cadmium, nickel, and lead, in both first and second-hand vapor. Again, these were present in concentrations a magnitude lower than conventional cigarettes but at high enough levels that they could arguably fall under California's Proposition 65 rules for mandatory labeling of their carcinogenic nature.
A recent ****-study by Dr. Priscilla Callahan-Lyon of the FDA's Center for Tobacco Products examining data from 18 previous studies on e-cig vapor found that most contained at least trace amounts of the solvents used to dissolve the nicotine and flavorings. These solvents are potent lung irritants and, upon heating, can be converted to carcinogenic compounds known as carboxyls."
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