https://www.wikihow.com/Make-Black-Powder

re read what you quoted, and then re read op’s question, then re read what i said.

pesticides, pharmeceuticals, PFAS or forever chemicals. all can be made much worse by boiling at over 500c, just forna few examples.

they can get even worse than previous forms, so yes.

Because you’re essentially cooking a cocktail of complex chemicals, many of which were never designed to be heated, and the result is often airborne toxins and volatile organic compounds (VOCs) that are far worse than drinking trace amounts of the original chemicals.the chemicals dont vanish or turn into pure air when vaporized. they degrade into other more harmful chemicals. which are carcinogenic and more toxic.