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Actually we were given cocaine for teething problems, and it was harmless and effective as a topical anesthetic.
Ate a snack cake thing I got yesterday, and then discovered a warning about lead and cadmium on the back of the package
https://www.nationalgeographic.com/culture/article/dress-hat-fashion-clothing-mercury-arsenic-poison-history
Thanks for the interesting read!
This means however the hat thing isn't entirely correct, see the paragraph at the end of the article:
And besides, the mercury only affected the hatters—not the men who wore the hats, who were protected by the hats’ lining.