A study led by researchers at the Johns Hopkins Bloomberg School of Public Health found high levels of toxic metals in the liquid that creates the aerosol that e-cigarette users inhale when they vape.

Compared with e-cigarettes with liquids that were not flavored with menthol, menthol-flavored products produced a significantly higher level of 1-10 µm particles when inhaled, reported Kambez H. Benam ...