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> ranging from < limit of qualification (LOQ) to 239 μg/e-cigarette. 2,3-pentanedione and acetoin were detected in 23 and 46 of the 51 flavors tested at concentrations up to 64 and 529 μg/e-cigarette, respectively.

From the article's abstract http://ehp.niehs.nih.gov/15-10185/

I have no idea what those numbers mean or if they're bad for you. But there they are...

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Nice! I didn't know the abstract was available.

I guess the question is what is the level of diacetyl in the vapor inhaled? The CDC has set a limit of 25 ppb for short term exposure.

You don't want to be around any diacetyl at all. If the lab can detect it, it's too much. It's very, very nasty business.

You better stay away from beer then...

Or just avoid inhaling beer? Granted if it is found in beer at all it would seem likely that just slurping foam would put one over a limit of 25 parts per billion?

Actually, I suppose it's entirely possible that it's only dangerous to inhale if it is vaporised, not just encapsulated in drops?

The FDA says that is under the daily maximum:

>The per capita daily intake of diacetyl added to food, both as a component of starter distillate and as diacetyl itself , is estimated to be less than 0.3 mg.

http://www.fda.gov/Food/IngredientsPackagingLabeling/GRAS/SC...

There's a big difference between ingestion and inhalation.

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