content: You don't even have to make it past the subtitle of your article, but it's reiterated in the opening paragraph that frequent use of marijuana lowers cognitive function.  Of course I've smoked enough in the last three decades to know the truth, and am under no delusions about its ability to dull the mind. No scientific papers needed. I've lived the experiment to my general detriment.  And of course I've watched enough Cheech and Chong to know Tommy's use is heavy, not casual.