You missed the point completely but never mind. I'm sure you will Google cannabis psychosis and then copy/paste the first article you find right here (with your added emphasis).
And, as if on queue.
Now, how's your reading comprehension?
We have a story about one unfortunate guy, out of probably several thousand, who may have smoked or otherwise consumed cannabis. This one guy has then had some form of psychotic event. We don't know for sure what has caused it.
I said cannabis psychosis is real. Some others here have acknowledged that, with some offering anecdotal evidence. I did not say it was the confirmed cause of this, or any of the other frequent reports of inexplicably weird, dangerous or violent behaviour from obviously disturbed individuals. It may be rare, like the one in several thousand I suggested above, but it does exist.
Anyway, thanks for the copy/paste of an article that also includes the words, "serious... acute symptoms... very serious... acute and temporary... some people will be more vulnerable", etc. (my emphasis).