Monoamine oxidase inhibitory activity of flavoured e-cigarette liquids
https://www.sciencedirect.com/science/article/abs/pii/S01618...Reinforcement and MAO-A inhibition in heated tobacco products: flavor and brand variations
https://www.frontiersin.org/journals/psychiatry/articles/10....
Comparison of monoamine oxidase inhibition by cigarettes and modified risk tobacco products
https://www.sciencedirect.com/science/article/pii/S221475001...
There is of course variance depending on the exact flavorants used. For example, menthol and mint flavors don’t inhibit MAO, their activity is towards kappa-opioid agonism (induction of dysphoria).