I have an alternate theory, regardless of what the article concludes......smoking marijuana on a regular basis contributes heavily in bringing out an underlying condition which many people have, but are not totally aware of. This condition is what I will call "stupid". I have 10 years or so of research on working age adults to prove it. After a weekend of casual marijuana use, even the lower THC, cheaper varieties, employees will come back to work Monday, or Tuesday in a state of "stupid".
I hope they find a cure for it, maybe by taxing pot we can convince the government to do more research on this important issue. A cure could revolutionize humanity.
LOL--but after the weekend-even without pot-I bet people are stupid. I am pretty stupid on Mondays!!!
And you didn't even mention people who booze on the weekends, I bet they are stupid and hurting!!!