They're everywhere; and now, also in most all human blood.  The chemical industry claims some are safer than others, but where's the proof?  Below is a must-see clip, and below that are my notes.  [Sorry, no time to write them out in proper sentences.]
 https://www.youtube.com/watch?v=Jwwu5KchDcU&list=WL&index=71
per- and polyfluoroalkyl substances - a few thousand different ones - in Teflon, Scotchgard, fire retardant fabric, cosmetics, paper plates, fast food containers, ski wax, guitar strings, & many other products.  Liver damage, cancer, endocrine/hormone disruption, neurological damage, & more.  "Forever chemicals" which bioaccumulate.
DDT was banned in the USA.  So were CFCs and PCBs.  ALL PFAS should join that club.  Wake up, politicians.  Stop kow-towing to the chemical industry.
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Not only my opinion.  Take Care