I don't know anything about this other chemical. (1) It is true that no other nicotine product produces the same "fix" as burning tobacco. But (2), other nicotine products definitely do fill 70-80% of the craving, and I think the rest is mostly down to habit.
Bollocks. I chain-vaped (juice which contained only propylene glycol, glycerol and nicotine) as much as I chain-smoked. Perhaps more, as vapour wasn't as hard to my lungs as actual smoke.
MAOI just make the addiction stronger, but are not the addiction themselves.
Unlike liquid-based vapes which use pure nicotine, Juul pods contain a tobacco leaf extract. I don’t have a source to confirm, but I find it likely they do contain MAOIs.
I take it you have tried alternatives containing only nicotine, but they just weren’t the same?
Note that successfully quitting smoking usually means quitting coffee, too, since coffee contains the exact same monoamine oxidase inhibitors.