I disagree, especially considering high THC strains. In general, coffee, tobacco and alcohol are milder. People can do stupid stuff after having too much alcohol, but I'm not sure I would consider that psychosis. Having too much THC can make someone feel a bit crazy (or maybe a lot crazy). It can even be somewhat psychedelic at higher doses, so there's just some variability there. The thing is that THC can also make people feel pretty relaxed, so they wouldn't necessarily want to go out and do something stupid, but I'm just saying that it isn't a guarantee. I think there is some risk, at least for acute episodes, and I personally don't think it's just FUD.