I think it's because the majority stop giving fucks about learning/just learning/life in general when they get high (provided they don't get high and bring harm to themselves which would explain the low IQ) and don't give fucks about anything ever... thus they don't know/remember how to write the average essay on pot itself, or maybe some other essentially simple academic things.
Then again some people might be taking Marijuana at 'the right times' (the wrong times with the wrong conditions/people), and messing up their brains as they develop anyways.
Anyone could react to any substance differently, right? And what about all the environmental conditions in their life? Would being exposed to hormone blockers/growth hormone on a regular basis fuck up the chemistry/affect someone more adversely than the everyday adolescent/person smoking cannabis?
And then some people could be wired in such a way that exposure to the chemicals in said drug would mess with them anyways. Are there
Genetic Markers responsible?
Seb is without a doubt
still smarter than most people
and this probably wouldn't include him because I'm pretty sure the Universe speaks to him when he trips balls anyways.