That's why I said it was "a little misleading" rather that outright false. "poisonous" sort of implies that the object itself is poisonous or is bad for you. I'm sure manufacturing a smartphone causes a bunch of environmental damage, but you wouldn't call it poisonous (outside of putting in in your mouth).
>2. Teflon is extremely hazardous when consumed and it flakes off of the pans over time (which is why they must be replaced often) or when incorrect utensils are used (common among unsophisticated users).
source? This is contradicted by https://en.wikipedia.org/wiki/Polytetrafluoroethylene#Safety
>3. Teflon can overheat on a standard consumer stove using standard cooking techniques. You actually need different techniques to prevent overheating a Teflon pan.
Like I said in my initial comment, teflon has its uses. I'm not saying it's the best tool for every job. Given that, I highly doubt this applies if I'm just cooking my eggs.
>4. Cast Iron is effectively non-stick after enough use, and you can absolutely fry an egg in it without sticking if you have a smooth-bottom pan (either a vintage cast iron, new vintage-style, or a new style that you've sanded down and seasoned yourself).
Sounds like a lot of work to me. In other words, the teflon pan is actually more convenient.