Dr. Farsolinos’s study also measured the safety limits of the E-Juices that contained diacetyl and acetyl propionyl. Using the NIOSH (National Institute for Occupational Safety and Health) guidelines, it was found that both diacetyl and acetyl propionyl were found to have more than double times the NIOSH safety guidelines. It is worth nothing however that both diacetyl and acetyl propionyl are found in regular cigarettes. However, the levels of concentration in regular cigarettes are a 100 times more for diacetyl and ten times more for acetyl propionyl than the E-Juices that were tested. Considering obliterative bronchiolitis is not a known disease among smokers (even the heavy pack a day smokers) we can assume that even at double the NIOSH standards the levels of diacetyl and acetyl propionyl are not fatal. This is just an assumption much more research of the effects of diacetyl and acetyl propionyl are needed before making a clear judgment.

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