It kills motivation and intelligence in some people only while impaired, not after. Yes, some people just choose to be impaired constantly.
But those people wouldn’t care anyway. If pot wasn’t available, they’d be drinking booze or popping pills. And if that wasn’t available they’d be sniffing glue and gasoline. Or choking themselves or sniffing dung.
Some people will ALWAYS want to be wrecked NOMATTER WHAT and we don’t need a police state to watch all of us because of those mentally ill people.
Sigh. There are studies of permanent damage to intellect out there. Ignore them all you want, I’m sure the idea that you’re stupider than before you used isn’t a comforting idea.