exactly, weed doesn't cause any of this, but consuming cannabis can be an experience that brings out a condition they already have or are prone to, and it's not clear if avoiding cannabis would have stopped them from developing the condition, just speeding it up i guess, there's not a lot of research into it though.

all i'm saying is it seems silly to compare weed to potatoes and water because they are completely harmless, you have to be completely retarded to OD on potatoes ya know? and you're not going to OD on weed either, even if you are completely retarded. but there are risks that moderate use of cannabis pose to unhealthy individuals that just don't exist with potatoes or water. i don't like to say cannabis is completely harmless especially because a lot of prohibitionist types won't even try to understand that and brush you off as stupid, even though it's a valid point. it is one of the safest activities you could do though, i saw a government anti drug commercial that even confirmed this, their message was that you'll miss life sitting on the couch, he didn't try heroin or do this or kill somebody or whatnot, he just sat on the couch and didn't do much of anything, good reason to make crimminals out of people, ya know, damn you're missing out on living life to the edge man, get in jail!