There are some suspected and known harms certain enough to be published by the EPA https://www.epa.gov/pfas/our-current-understanding-human-health-and-environme

There are some suspected and known harms certain enough to be published by the EPA https://www.epa.gov/pfas/our-current-understanding-human-health-and-environmental-risks-pfas https://www.epa.gov/pfas/our-current-understanding-human-hea... You're right we're not completely certain, but I think it would be prudent to immediately cut back on all PFAS except scenarios where no viable alternative exists since they are so hard to remove from the environment. As nice as non-stick PFAS pans are, they need to go for now until we know more.