Marketed as safe and cool with fun flavors and clever devices, vapes are hooking a new generation on nicotine. Health experts warn that it's not only water vapor and nicotine surging into the lungs: All kinds of other chemicals are ingested too. Psychiatrist Sara Polley, MD, talks with host William C. Moyers about the prevalence, known health risks and highly addictive potential of vaping among youth. The doctor's bottom line? No amount or form of nicotine is helpful for a young person. Listen in.