Teenagers' gender, sexual orientation, household income and their parents' level of education are among factors that impact whether they believe that nicotine, toxins and other chemicals in e-cigarette and vaping products are harmful to their health, according to new research [...] "One of the challenges with educational efforts aimed at getting youth to stop using e-cigarettes or preventing them from starting is that many believe e-cigarettes are harmless," said study lead author Thanh-Huyen T. Vu, [...]