It is uncomfortable but true that some chemical exposures can make people appear to be crazy — just plain nuts. However, remove the exposure and the “nuts” goes away. I’ve seen it happen over and over.
There is a second “however” to deal with. Over time, exposures take a toll — and it can become a permanent toll — on a person’s mental state. Sadly, we have witnessed downward spirals in some people that leave them no longer able to think, or talk coherently. By that time, any recovery is going to be uncertain and a long time coming.