I also wonder what their lifestyles are in general, and if it would have an effect. I feel like weed puts my brain into autopilot to a degree and makes me 'okay' with w/e I am doing. So recreational usage I could see making you 'dumber' cause weed lets you feel okay doing nothing and doing nothing is a good way to be dumber

My anecdotal opinion for someone that smokes a lot compared to their long-term cannabis users, maybe once or twice a night vs 1 to 4 times weekly. I'm late twenties have been smoking since my early twenties, obsessed with brain optimization and min maxing performance etc. I feel like I've gotten smarter in some areas and dumber in others, which lines up with how weed affects the reward circuits of the brain imho. So I've been using it as a reward for doing stuff I otherwise would be uncomfortable with trying, like a new project or new hobbies; anything worth doing is worth doing poorly. So I think it has helped me get smarter programming and developing intuition on some areas, but since I have avoided writing like the plague it's gotten terrible to be honest. Personally it feels like it just tunnels you in further to what ever you are doing, and possibly makes it harder to stop doing it even not high