The extremely toxic PFOA and PFOS are byproducts of manufacturing Teflon. After decades, we have managed to just barely regulate it. We don't know if these newer compounds will ultimately have similar effects. DuPont had reason to believe these original compounds were harmful, but they suppressed that fact in favor of profit. "Probably fine" is not acceptable, considering we can't meaningfully clean the stuff up.

https://en.wikipedia.org/wiki/Timeline_of_events_related_to_...