Yes, there are several effects of cannabis that are well known, but your notion of the effects thereof of a person's life is merely something you've been told by people you trust and did not check their references. Reality does not bear them out.
I think it needs to be repeated, because you missed something in what I said from the last post you're referring to.
"Yeah, the universities are full of math and science students that smoke pot while they study and before they take tests."