reporter: i traveled to virginia commonwealth university in richmond to meet this rese e researcher who s investigating vaping during this cbd craze. if it happens to be tainted you re increasing a rapid response of whatever it s adulterated with, which is some of the concern here. sanjay gupta is with us now. a lot of consumers will be surprised to find out cbd is not always safe. the issue, cbd itself, pure cbd is safe. it can be a medicine, it s nonpsycho active. the problem, it s a totally or wholly unregulated industry, which means when you buy a product you don t have any guarantee that, in fact it is what it says it is and some of these cases we re hearing, the people you see in the documentary film, they weren t getting cbd at all. even though it was labeled cbd,