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I guessed this might be about PFOA when I saw the headline! https://en.wikipedia.org/wiki/Perfluorooctanoic_acid has the whole story, minus the anecdotes. Apparently a few parts per billion of PFOA in your drinking water is enough to detectably raise your risk of some cancers. Most environmental regulatory agencies propose 0.5 to 1 ppb as a safe limit for drinking water, while 4–5 ppb blood serum levels of PFOA are currently common among "unexposed Germans".

I was pleased to see that they aren't hyping the risk of cooking on Teflon.

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