The word 'Plastic' needs to die. Instead we should be more specific on the type of plastic. Teflon, PLA, ABS, resins, foams, etc... are all plastics, but they are so unrelated outside their long chains, its terrible to stereotype them all into one category. You aren't going to get cancer from PLA or Teflon, but rather the manufacturing process. You can eat these plastics as far as I know and you'd be fine. Eat someth…
Teflon Aka Polytetrafluoroethylene cookware represents a health hazard. The stuff contains a great deal of Florine and breaks down at 300C, but that’s not purely binary instead it becomes increasingly unstable as your approach the temperature. Further no manufacturing process is perfect, I wouldn’t therefore assume eating significant quantities would be safe. That said, it’s generally used as a coating rather than a…
And table salt is made out of Sodium and Chlorine, one of which is explosive when mixed with water, and the other is used to gas soldiers in trenches if you're into committing war crimes.
What matters is what effect the particular chemical has when you put it through common household uses, not the effect of its constituent parts.