alt Hacker News“Carbogen” has an interesting history.
https://en.wikipedia.org/wiki/Carbogen
It has some sort of mind altering effect, and in the early days of psychedelic psychotherapy it was used to determine whether someone would freak out under the influence of mind altering substances.
I understood why it's called "Carbogen" only after reading (on your provided Wikipedia page) about it being a mixture of "Carbo(n)" + "(Oxy)gen". This is an unfortunate naming habit, because logically "Carbogen" would rather mean "Carbon producer" or "Carbon generator".