Same stretch that correlation of those things equals causation.
To prove damage you must have multiple controlled twin studies showing direct damage like with any other drug you find on the pharmacy shelf. To date this had not happened with cannabis and all these “pot correlation” studies are meainginless.
But who ever said that smoking causes schizophrenia? No one that I know of.
Whereas smoking cannabis clearly can cause people to appear disoriented, lazy, and stupid, which would cause some of the life effects/results mentioned in the article I referred to.
These guys know a lot about it...
https://www.youtube.com/watch?v=FAaTp_WCREw