What's in vapes? Toxins, heavy metals, maybe radioactive polonium ABC News E cigarette Myths Go Up In Smoke St. George Medical Clinic Secondhand e cigarette aerosols expose kids to less nicotine than cigarettes, study finds, but can still be risky CNN Second hand vape smoke linked to more asthma symptoms in kids Don't Vape Your Health Away UConn Today Vaping Impairs Vascular Function, Even Without Nicotine, Study Finds