Altogether, between 20 and 27 percent of e-cigarette vapor’s ultrafine particles make their way into the circulatory system, compared to 25 to 35 percent for regular cigarettes. A recent report from Science News points out that these nanoparticles can trigger inflammation in the mucus membrane and have been linked to chronic diseases like asthma, stroke, heart disease, and diabetes. We’re In Unknown Territory Even the supposedly inert chemical substrate of e-liquid, propylene glycol, can have some pretty nasty effects on your body when heated and inhaled. Propylene glycol (PG) is a ubiquitous synthetic liquid added to a variety of foods, cosmetics, and medicines as a humidifying agent. For these functions, the FDA has rated PG as GRAS, or Generally Recognized As Safe, the agency’s general seal of approval basically.
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Safe or not? More studies examine the risk of electronic cigarettes |

A U.S. Department of Transportation spokeswoman said the agency, which regulates which items are deemed hazardous on planes, is not currently considering further restrictions on personal devices. Freni, of the Massachusetts Port Authority, says not enough attention has been paid to potential fire safety issues around e-cigarettes.

Official: Feds should look at e-cigs on planes –

R.J. Reynolds Vapor Co. is sponsoring a study to determine what potential risks there are in the vapor smoke emitted from an e-cig compared with a combustible cigarette. The study began in May with 72 participants at Clinical Research Atlanta and is expected to last until December, according to a filing on a website for the National Institutes of Health.
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