Watch the 2019 film Deep Waters currently streaming on BBC iPlayer. It's the true story of US corporate lawyer Rob Bilott who went after chemical giant DuPont for poisoning communities with Perfluorooctanoic Acid (PFOA) the chemical used in the manuafacture of Teflon.
In 2017 he won a $671 million settlement on behalf of more than 3,500 plaintiffs who had been made ill or their babies born deformed because of the chemical. Watch the film, look up articles about PFAS, PFOA, PTFE and C8 and read the numerous articles about Bilott and his fight for justice. Here are a couple:
time.com/5737451/dark-waters-true-story-rob-bilott/
www.ewg.org/areas-focus/toxic-chemicals/pfas-chemicals
These were cases of people who had worked in production at Du Pont, had drinking water contaminated by Du Pont waste or had to work closely with Du Pont products e.g. firemen working with fire suppressant foam.
How dangerous Teflon is in small scale exposure is hard to say but PFOA/C8 is described as a forever chemical that stays in our bodies and can cause illness years later. It's wise to be wary of it.