Terpenes and more importantly (due to the amount found in carts) the cut (most likely PG) are shown to release several more toxins at higher temperatures that the torch easily reaches.
The only way I would ever attempt this is with proper LOW TEMP DAB experience on a dab rig, and I mean super low temp dabbing. If you can feel the vapor, it's too hot and probably toxic as well.
I've been using a torch for rigs for almost a decade now, and I feel like I'm JUST now able to consistently get low temperature dabs without much effort. Dabbing PG is definitely a last resort resolution.