The rest of the story is nicely summarized by Jacob Sullum in a Reason.com . He concludes:

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.

When I looked at the bottle, I saw that the E-Juice wasn’t clear or see through like the E-Juices I bought from retailers. In fact, it was cloudy and very similar to a bottle of oil and vinegar. Long story short, it wasn’t completely homogeneous yet that is the flavoring hasn’t bonded with the base completely. I shook it for what felt like a good 30 minutes and it was still very cloudy.

The Business Standard and Medical Xpress reporters were not the only ones to get this message from the study and its authors. According to an on the CBS Atlanta web site: "Exposure to surfaces and objects that have been saturated in cigarette smoke, labeled as “third-hand smoke,” may be as deadly as smoking the cigarette itself."

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