Whoa. Them's fightin' words. Hold on to your box mods, because it gets worse. E-cigs carry unique risks not found in cigarettes, mainly from ingredients in the "juice" flavorings: formaldehyde, acetylpropionyl, acetoin, and diacetyl, all of which are carcinogens or irritants. E-cigarette aerosol also can contain traces of metals like tin, silver, iron, copper, nickel, and aluminum, Dr. Weiss says. "While some may claim that these traces are small, it doesn't take very much to reach toxic levels," he adds. And while manufacturers point out that ingredients like glycerin or propylene glycol are generally recognized as safe by the FDA, that designation only applies when the ingredients are eaten -- not when they’re inhaled.
Don’t forget that vaping does all the same terrible stuff to your body that smoking does (minus the tar): it increases your blood pressure, heart rate, breathing rate, white blood cell count, plus it can enhance systemic inflammation and alter your metabolic rate, Dr. Weiss says. And of course, good old nicotine causes coronary artery diseases and increases the risk of stroke, Dr. Sanati points out.