“We do know that e-cigarettes do not emit a harmless aerosol,” he explained. “There’s a variety of harmful ingredients identified, including things like ultrafine particulates, heavy metals like lead and cancer causing chemicals. And flavoring used in e-cigarettes to give it a buttery flavor, diacetyl, it’s been related to severe respiratory illness.”

"People often assume that these e-liquids are a final product once they are mixed. But the reactions create new molecules"