That's certainly one story, but the more plausible one is that people who are more productive --and have more productivity to lose-- are less likely to smoke marijuana. Equivalently, marijuana smokers are generally less productive.
I don't know about that, I did multiple degrees and I'm working on a PhD and I smoke and use edibles all the time. I know other people who are similar.
Almost like cannabis use is independent of productivity and the lazy stoner stereotype is a drug war myth, weird huh