I favor legalizing the use of cannabis, but don't like the stuff, don't use it and don't want to be around those who do. It's partly because I used to know a woman in Chicago, a very smart University of Chicago grad who'd fried her brain by incessantly smoking the stuff.
But even I didn't realize that marijuana could do the kind of damage described in this fascinating article. It turns out that British scientists have known for a long time that heavy weed smoking can induce psychosis. Especially today's cannabis, which is far, far more potent than that of a few decades ago.
And yet an unholy alliance of corporations and governments is trying to mainstream marijuana use in the US. The corporations want the profits; the governments want the tax revenues. And nobody much cares about the impending brain damage, and all the awful consequences thereof.