Well you can give mammals lead and they turn batshit crazy, everytime and in short periods of time.

If you give them plastic, some studies find some behavioral changes depending on what plastic, which particle sizes and how its administered, but to be honest it doesnt seem to play in the same league as lead at all.

Like in this study: https://pmc.ncbi.nlm.nih.gov/articles/PMC7282048/ Table 1: Wistar rat, 10mg/kg oral 35 days, no alterations in behaviour.

Not saying there is no effect at all, there likely is, but here we have to look carefully for it, while with lead poisoning you could see and hear the “alterations in behaviour” from 100m away.

In my first practical chemistry course I referred to a container filled with gas as “gas chamber”, to make things worse I am german…

You can see it from space