It's a shame there aren't any good lists either on here or anywhere. I've been googling and searching these forums like crazy and although there's info, it's spotty for the most part, or requires you to dig through threads and websites and links and articles, etc.
The last few days I've at least found about a dozen e-juice companies who confirm through 3rd party testing they're free of diketones. From this point on I'm only ordering from those and others who confirm. I get the titles and vague tones in some of those articles a couple years ago were fear mongering and that they'll probably realize other chemicals are bad to vape as well, but I'd like to minimize the harm I'm doing as much as possible, or else why'd I even quit smoking?
No reason to knowingly inhale chemicals which are known to lead to stuff like COPD, even if they're in minuscule amounts compared to analogs. I remember sometimes we'd be at work in a hazardous environment if you didn't just wear a simple respirator and I'd refuse to go in until they were provided. One of the guys I worked with smoked as well and he'd always say to me, "All the cigarettes we smoke and you're worried about breathing this crap in?" And I'd reply to him, "Just because I smoke cigarettes doesn't mean I hang out at the top of a cooling tower at a nuclear power plant breathing in the byproduct every weekend.", or, "Just because I smoke cigarettes doesn't mean I want to do the backstroke in a room full of loose asbestos." Lol.