I'm surprised that no one in this thread has used the word "hangover" yet, because that's exactly what these researchers have quantified. They certainly haven't

I'm surprised that no one in this thread has used the word "hangover" yet, because that's exactly what these researchers have quantified. They certainly haven't "discovered" it, because anyone who is familiar with cannabis can attest that, just as with alcohol, if you get super high, you're going to feel it the next day. To put it simply, if you get really wrecked on weed, the next day you're going to be stupid. With that said, unlike with alcohol where hangovers are quite unpleasant, I suspect that a lot of cannabis users enjoy the next-day feeling. If you are like many people in technology whose minds are continually churning, problem-solving, absorbing and processing information, checking your phone, reading HN, obsessing over whatever idea and in general running on the mental hamster wheel that so many smart people struggle to take a break from, the feeling of being stupid and slow can be quite nice.