With the recent headlines of illnesses and deaths attributed to vaping and the CEO of Juul promptly resigning, the nation's attention is focused on e-cigarettes. So what is vaping? And what exactly is the threat it poses to our youth? In the first episode of a series on vaping, Dr. Daniel Amen and Tana Amen describe the physiological issues associated with e-cigarettes, and why their marketing campaigns have become so problematic.