Man, IDK. Thanks cozzicon for crunching the numbers (or at least 1 set of them). Thanks to others for all these posts. I have about 10ml of juice that probably contains diacetyl and I think I will toss it to be safe. I also have some 50 ml of RYx from a very trust-worthy vendor (and I think it has FA flavors) that I'm now unsure of (the juice ingredients, I mean). But, hell...50 ml of juice. Do I just thow it out on a "scare" or does it really contain any diacetyl? If Cozzicon's numbers are correct, I'd have to use it for 500 years to worry. I just don't even know if it is there, or what else is there.
I agree with the testing approach. The FDA may very well agree too. But that's probably a regulatory issue.
As a consumer, I would like to avoid diacetyl and some of the other known issues with flavoring chemicals. I was told that some companies "don't support
vaping" because they claim that their products are not tested for it (how many are?). Now I see even FA says "made for FOOD flavoring use". IDK. Maybe I'll just keep looking for the "simplest" flavoring, or vape unflavored (eck!). I'm not favoring one company over another, and I don't know if some e-juice vendor's secret recipe contains flavor x, y, or z from one flavor vendor or many.
To the OP's point, I vote for avoiding diacetyl completely in the future and applaud FA for their full disclosure. I would like to order non-diacetyl FA flavors in the future to support them. I would like the juice maker's/mixers/vendors to disclose diacetyl information. For example, I have some Caramel and Bavarian Cream that I just ordered from an e-juice vendor and I don't know who makes the flavors. So now what? The vendor should disclose the diacetyl info, if not the flavor vendor. These flavors may or may not contain diacetyl.
I'm not panicking tho. I'll probably will pour out some juice.... I hope I can stick to simple flavors... if that means anything.