> I think the only thing we can say with certainty is that things that have been around long enough (like cast iron, clay cooking ware etc.) is most likely safe

> I think the only thing we can say with certainty is that things that have been around long enough (like cast iron, clay cooking ware etc.) is most likely safe, otherwise we would have noticed it by now. Agree, I think this is the most important part. I think we obsess too much over things that might possibly have some small effect 1% of the time after 30 years or something after you apply a bunch of tricky statistics. Anything that has been used by millions of people for decades, centuries, would have been extremely obvious if it did anything bad.