Juul, a tool to quit smoking, is latest drug to hook American teenagers
Juul, the most popular brand of e-cigarettes, was designed to help smokers quit by giving them the nicotine their bodies crave without the harmful side-effects of lighting up. But now American teenagers who have never smoked are getting hooked on Juul, calling it a "harmless cigarette." Health experts disagree. Plus, learn the English phrasal verb "sweep through."