Hmmm... yeah... well toasters don't have nic juice (too bad? lol). The juice has a lower boiling point and must carry some heat away with it. Kind of like how you can boil water in a paper cup... until the water is gone, then the cup goes up.
OTOH, I've wondered if hot "spots" could still develop, etc. and have wondered about VG producing nasties too. So far, from what I have read, this is not the case. But, I don't trust the "VG is more natural" nor the "aquarium stuff is good" logic. Arsenic is natural too but I don't suggest you vape it. Same reason I don't use cartos.. I've seen burnt "carto insides" pictures. Since I'm off tobacco I'm trying to keep it as "clean" as possible. I like to see that it is not burning, so I use carts.
That said, I have not seen any data that suggests that blue foam, PTB, polyfill burns in carts. High-volt/watt guys may be an exception. Check the cart and see if any material is missing, don't trim it and stick it in the atty without making sure it is clean/free of little particles. Don't twist it on the bridge and "grate" it on the wire wick. The bridge doesn't seem to get too awful hot, but who knows? The little "wick fibers" in an atty might burn too. Hmmm....
I'd say monitor it and keep it "clean". I hope, when the scientists/FDA lose the attitude and do proper testing and monitoring, they find that it is safe, or at least much safer. And I hope they test with a typical Atty/batt combination. Maybe they will test with blue foam, PTB, high-voltage, etc.
Just some thoughts and my 2 cents.

Ramble complete. Good luck to us all.
