At work they use a Teflon material to coat rollers for printers and copiers. I do not work directly with the stuff but have worked on the air handlers and associated equipment.
That stuff is nasty smelling!

There is retox burner that I think fires at 1,800F~ it is highly regulated to burn off all the nasty gases and volatile goodies.
Large CFM's of out side make-up are are required to keep fumes down. The term we use "the solution to pollution is dilution".
I'd have to say if you heat a frying pan to 300C which is about 572F you're going to ruin the pan, smoke up the kitchen and probably will make yourself ill till the smell clears out. As far as everyday cooking I've other things to worry about than my fry pan non stick killing me. If the pan is looking more like an aluminum cookie sheet then its time to get a new one.
While were on the topic of fry pans, why is it people let there cast iron pans take on the look of an old coal boiler's fie box?
They call it seasoning when the pan is all crudded up~ man talk about food borne bug on its way to your guts.
bpb