Lawmakers are stepping up efforts to crack down on the e-cigarette flavors that are fueling popularity in vape companies such as Juul. a new bill proposal, called "Stopping Appealing Flavors in E-Cigarettes for Kids" would require vape manufacturers to prove their flavorings aren't harmful, or else the products would be yanked from the market. is Rachel Becker, Science Journalist at The Verge, joined to discuss.