As a parent, we do our best to know what our children are doing when we can't be with them. But when it comes to vaping and e-cigarettes, they're a bit easier to hide than traditional marijuana use or cigarette smoking.

Dr. Susan Walley is a Pediatrics Specialist, as well as the chair of the AAP Section on Tobacco Control. She breaks down what e-cigarettes are, why people think they're "safer" when they're really not, and all of the lung problems that affect vape users.