Yes, THC causes psychosis

 When you're talking about modern marijuana or edibles, the stuff people are using now is a far cry from what people waxed poetic about decades ago.

While cannabis-induced psychosis won’t affect most people after they halt their use, for some, it can persist for weeks or months before things return to normal, Finn said. “So this is potentially a very dangerous product, particularly if there’s a young person that is exposed.”

There just aren’t enough placements available for the mental health care needed, he said.

“And in a very rare circumstance, sometimes [the psychosis] doesn’t reverse at all,” he added. “There’s a very strong correlation to cannabis use of high potency with schizophrenia, although it the link of a causal effect has not clearly been proven but it’s strongly suspected.”

Here's how I would explain it.

Way back in the foggy days of yore, the weed that people had access to was like a can of beer.  The weed people are getting now is that same can, only it's full of whiskey, not beer.  And people are still drinking the full can.

Soon it'll be full of Everclear.  And people will still drink the full can.  That ain't good for your mental health.

And as I've said previously, the increase in TCH does not have a corresponding increase in CBD.  TCH is the psychotic, CBD is the anti-psychotic.  People who get relief from marijuana (pain, cancer, etc) are getting relief from the CBD, not the THC.  So if all you're getting is a higher level of THC, then all you're getting is more of the psychotic agent.

That's not a good thing.  But in the end that almost doesn't matter, because most people today aren't using edibles or weed for pain relief, they're just wanting to get intoxicated.  I do know some people who use CBD for pain relief in my personal life.  They tend to grow their own, or they get a CBD compound that has small amounts of THC in it.

Anyway, this is just more of me saying "Don't let your kids think that smoking weed is harmless".  It's not.  Back in the day it just caused a bit of apathy.  Today?  The long-term effects are far worse.