You either haven’t been reading what I’ve written or you didn’t read your own link. Most of the health effects it cites reference chronic use (which no one is advocating) or use by people whose brains are still developing (again, which no one is advocating.)
And sure, weed carries with it some potential negative effects. Just like alcohol, or an extra large pizza. I’m not saying “everyone should smoke weed all the time.” I’m saying adults should get to weigh those effects for themselves.