This summer, the explosion of vaping-related illnesses sent medical researchers on an urgent quest to figure out why teenagers were showing up at the hospital unable to breathe. Years before this became a public health crisis, federal regulators had the power to crack down on e-cigarettes. Why didn’t they do it?Guest: Desmond Jenson, an attorney with the Public Health Law Center at the Mitchell Hamline School of Law.Slate Plus members get bonus segments and ad-free podcast feeds. Sign up now. Learn more about your ad choices. Visit megaphone.fm/adchoices