Plastics Contain Thousands More Chemicals Than Thought, and Most Are Unregulated

Probably a lot of them are byproducts, side reactions etc. Things which form chemically alongside the main "plastic-making" reactions. Kind of like how car exhaust contains all sorts of compounds (most of which are burnt up by the catalytic converter, fortunately) other than CO2 and H2O.

Not the voting populations, but yes, regulators should be aware of this stuff. They've failed pretty badly if not.

Do you realize its made of crude oil, which is not some trivial molecule like h2o that just has many same copies.

There are different-quality crude oil, ie IIRC russian one is on averafe lower quality.

Its not what they add (which varies based on what they currently work on), but what was there before. And once you burn it what it becomes.