alt Hacker NewsFor what's it worth for an N=1 study I watched a relative's young family fall apart because of cannabis induced psychosis. They had two young kids, husband was smoking pot recreationally (not sure how long he was doing that) but at some point he started hearing aliens talking to him from the cracks in the wall. Naturally you can't just keep doing all the regular life and family stuff when you have more pressing issues like visitors from out of space in the walls talking about attacking earth.
I am not saying anyone should or should not use these substances, but that was enough of a lesson for me to know never to touch that stuff.
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Whether or not cannabis makes psychosis more likely isn't proven, but your N=1 study illustrates how bad it often is. People should know that psychosis isn't just having some weird ideas, but often destroys lives and families.
There is no established causal link between the two. Cannabis is so ubiquitous that it is often the case that people with underlying psychiatric problems find it calms them and then blame cannabis for it if they get worse, because that's saving face in a twisted way.
Link is not the same as "it causes it".
So I'm sorry that happened to your friend...
But also let's remember that there are tens of million Americans using weed products (legally in many states) who are having a great time with it. Which is why we need large-scale studies like this, and why any individual anecdote shouldn't offset a large study.