Nobody can figure out what's causing it, but hundreds of people are sick and six are dead. Most of them were young and healthy. The only thing they had in common was...vaping. That doesn't mean everyone who vapes is at risk. It could be a bad batch of black market product. But it does mean that there's a lot we don't know about a new way to consume tobacco that's becoming incredibly popular. So far, no cases have been reported in Canada. Or at least we haven't found them. But the American government is planning drastic action. So what is Health Canada doing? What do you need to know if someone you know vapes? And what happens to a young industry that's facing increasing public panic? GUEST: Carly Weeks, health reporter, The Globe and Mail