The Health Sciences Authority pointed out that e-cigarettes contain particulate matter, carcinogens such as carbonyl compounds, and organic volatile mixtures
Secondhand tobacco smoke is a mixture of the smoke given off by tobacco products, such as cigarettes, cigars or pipes, and the smoke exhaled by a smoker
Cigarettes with a short filter Military are made of a mixture of American Blend tobacco cuts, consisting of Virginia, Burley, and Oriental tobaccos
However, as with so much in the field of vaping, these claims need additional research, and there are many PG-free e-liquids available on the market today using water and glycerin as the carrier ingredient, rather than propylene glycol