Vaping uses electronic smoking devices – referred to as electronic cigarettes or e-cigarettes – that contain oil cartridges. The device heats the oil and releases a vapor that the user inhales. Many companies have created flavored oils that appeal to teens. Studies have shown that almost 40 percent of teens vape, up almost 10 percent from the year before. Medical and safety advocates are sounding the alarm, however, about the dangers of vaping, including addiction and health issues.