Irene Kim: You've heard of Juul. It's the highest-selling and fastest-growing e-cigarette on the market. In 2017, it generated $224 million in revenue. In 2018? $1 billion. And, as of February ...

Other e-cigs, toxic metals, and heart-attack risk Besides the Juul, dozens of other e-cigarette options are available in stores. These devices may pose health risks that range from a heightened ...