When I started vaping a few weeks ago, I dismissed diacetyl concerns based on what I read on vaping sites but I am now of the opinion it is the unknown we should be concerned with. Argument cigarettes have much higher level doesn't always have merit when some of us are vaping much more than the "average" from a study couple of years ago. Also there are no known case of popcorn lung because by the time smoker dies from lung related symptoms there's no point in investigating further the cause. It's only when a non-smoker dies from lung related illness, they would try to figure out what the cause was.
I'm all for regulating the industry to test for diacetyl because we can't really count on every manufacturer to test every line they carry.
You will never hear the term "popcorn lung" when it comes to smoking related illnesses because it's never called PL when people are suffering with the many respiratory issues caused by smoking .
It is also a mistake to say all e juice has much much lower levels of diketones than real cigarettes , out of the thousands of vendors out there today nobody knows what levels are present in each companies e juice and it can vary greatly even between the different flavor lines within the same company .
Evidence of this can be seen with the very popular vendor "Five Pawns" when some of their e juices were shown to have levels of diketones that exceeded those of real cigarettes. Don't know how that lawsuit panned out but anyway lol.
The thing that is concerning to some is that these days people are consuming HUGE quantities of juice compared to just a few years ago and every test i have seen is done with like a one hit Ego type e cig , the studies are laughable to me .
Most do feel that worthwhile studies will be released but down the road. If anyone is concerned about diketones choose an e juice that is free of it , lots are available today so you eliminate that concern completely .
Regardless of whether juice has diketones or not i have no doubt e cigs are much safer than real cigarettes .