News >Yale Medicine In short, the ingredients in e-cigarette liquid have caused users health problems. The health effects of e-cigarettes are still being studied but nicotine addiction, harmful chemical additives, battery explosions causing injury, acute nicotine poisoning and vaping related lung injury have all been linked to use of e-cigarettes and vaping. An e-cigarette is a battery-operated device that heats liquid into an aerosol that the user inhales. E-cigarettes typically operate on a rechargeable lithium-ion battery. Although there’s no definitive answer at this point, experts do have a theory about how vaping harms lungs. Young people who vape may be more likely to become addicted than adults. Nicotine exposure during this vital time can affect brain development in subtle and important ways. Research published in 2017 data american electronic cigarettes News > Yale Medicine