Following is a transcript of the video. 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.

Research suggests that vaping, or using e-cigarettes like the Juul to inhale heated vapor, is most likely better for you than smoking, which involves inhaling burned material. Still, e-cigs come ...