[const_cast]

Maybe what he’s referring to is the effects nicotine has on people with ADHD and ASD. It’s sort of a self-medication.

https://pubmed.ncbi.nlm.nih.gov/8741955/

There’s more you can find, too. Really interesting stuff. Unfortunate that nicotine is both incredibly harmful and incredibly addictive.

[rpmisms]

Nicotine itself isn't really harmful, though.

[const_cast]

It is, unfortunately. Over time it leads to cardiovascular damage.