What is kind of sad is that any research done on behalf of a company that involves their own products is unlikely to carry any weight with the FDA and could easily be spun to not carry any weight with the general public. We are used to seeing companies do their "own research" on their products (some of the most infamous are the tobacco industry's research about the time the risks became public knowledge. They still claimed through their research that tobacco was harmless). The FDA will have no interest in their research, even if conducted by a third-party, no matter how spot-on their methods are.
This whole thing is utterly ridiculous. There just needs to be regulations on who can make e-liquid. I don't agree with people making it in their kitchen and then selling it online. They have next to no scientific equipment, and possibly no chemistry training. The liquids tested likely had carcinogens in them because they did a full single-pass extraction from the tobacco, meaning that other chemicals were bound to be pulled over as well. On the other hand, if a large manufacturing industry was to be created, they could use pure, powder nicotine to create the liquid, and it would have nothing else in it (crystal nicotine is strictly regulated for public procurement because it can be used in poisonings).