Nobody knows for sure. Maybe a handful of Russians do.

Anyone versed in using it will probably have read a thing or two on the downside and want to say it's muh indirect dopamine from GABAB and TAAR. I'd add that's concentration dependant.

But I think there's something more fundamental than that. Maybe it's that it alters vascular tone and cardiac output. Or tempers alteration from psychoemotional stimuli. So to render wit is to remain relaxed.

https://pubmed.ncbi.nlm.nih.gov/3709776/
https://pubmed.ncbi.nlm.nih.gov/6825820/

Beware of it though. There are no free lunches that don't exist in nature. It's potentially useful to learn things.