Yeaaaah~, I'm constantly informing friends who enjoy their "Creamy Apple Pie" e-juice about the potential danger of diketones. It bothers me that there's no notice on these bottles of juice/on the vendor websites about the presence of diketones in their juice. Often you'll see, on most juice vendor websites, a notice about diacetyl/acetoin/acetyl, and ONLY that. Rarely (with the exception of Nicoticket, from what I've seen) do they mention diketones and the other potential nasties that we don't really know enough about.
One of the local juice makers/vendors I go to has a pretty strict "no diketone" policy in his juice. All of his e-liquid is made to specifically exclude flavor profiles that could be attributed to the presence of diketones. I really, REALLY like this policy. It makes me feel safe, and confident, that I'm not
vaping anything that could potentially be harmful to me. Worth mentioning, this B&M owner has ALL the chemicals ON DISPLAY in the store. He offers sniff/taste tests (because eating this stuff isn't harmful to you). He even has several mixed bottles of "POISON JUICE" as we affectionately call it. These are straight VG mixed with acetoin/acetyl/that nasty vanilla flavoring/other harmful flavorings. They exist so that customers who walk in with a bottle of diketone-y juice can be made aware of the flavorings in their juice. He'll offer tests (with a lengthy warning) of these poison juices so that you can notice the flavors that the chemicals impart on the e-liquid, so that you can go on to determine whether/not your juice has these chemicals in it.
Now, I don't expect to get away with saying this without getting flamed, but.. The presence of diketones is one of the reasons I think FDA regulation might actually be a good thing. If they can provide a standard for juice-manufacturers that limits the chemicals used in e-liquid flavoring to things that are known to be safe (or at least.. not harmful) and effectively enforce that standard, I'd say that's a very VERY good thing. As it is, any Joe Schmoe can throw some of that gnarly vanilla flavoring (forgot what it's called, but it's a nasty chemical and can give you kidney stones when vaporized) and open up his own e-juice website, selling his potential poison to the masses (and making a pretty good buck too). So.. The possibility of the FDA
positively regulating e-juice would be a good thing, solely to get some of these "poison juices" off the market.
My parting words are.. "Why?" The custard/cream e-juice fans are plenty, and even the ones that acknowledge the presence of diketones are still on-board. Why? The risks are somewhat known, but the unknown risks are what really scares me. What if inhaling a SMALL amount of diketones can cause problems? If that turns out to be the case, say, 5 years from now, I'd say the custard-cream-vapers are pretty screwed. Among other things, I'd be worried about the second-hand vapor from these diketone-ridden e-liquids. I just don't think the risk is worth the reward. Some people agree, and others take the extreme of switching to unflavored e-liquid. Personally, I think you gotta take some risks in life, but I stick to fruit and NET e-liquids, because (as far as I'm aware) those are far less likely to contain diketones (at least in larger amounts). The choice of flavors is one of the major things that got me so interested in vaping (and off cigarettes), so giving that up entirely would be a major bummer.
Well. That's my long post on diketones. I'm expectin' a bit of hate for that FDA bit, but (in your angry response) try to avoid the argument that, "The FDA will get rid of e-cigarettes entirely!" because as it is, that's kind of yet to be seen. I support CASAA and all, but I am very on-the-fence about the FDA regulation thing. On the one hand, I think it'd be good for keeping crap products out of the market. On the other hand, it would certainly put some hard-working vendors/etc. out of business for good. So I mean.. It's a definite trade-off either way. Whatever.