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I use high-temperature oils in general so I’m not sure if those get turned into harmful polymers. Do you know of any studies on that?

I found this article to be interesting and well sourced: https://examine.com/articles/are-cast-iron-pans-unsafe/

It doesn't find documented evidence of harmful effects of oil seasoning. Buy likewise for Teflon coating in normal heat conditions.

What I didn't expect is the part about iron leaching and its effects!