Well, the vibe I'm getting from these comments is people reacting emotionally, and assuming the study concludes that smoking cannabis causes memory problems. But the article itself says:

> The study has limitations. It was an uncontrolled, cross-sectional study, so the association seen between cannabis and brain function can’t be considered causal.

So even this study doesn't say it's causal, and admits to many other limitations. I agree with your point about evidence and science though, but this is hardly a smoking gun that cannabis makes you dumber.