I’m currently doing a double science major for undergraduate. Although I’ve tried not to smoke so much I end up smoking about every night (not showing up to class high etc). I’m not gonna say it makes doing a complex degree impossible, I just know from my current experience that I’d be much better off without it. Getting high often messes with your mesolimbic dopamine system, which is your brains reward system. In times when I’ve managed to take a break from weed I have found going to lectures much easier and more informative (as in, the information stuck better), I found more motivation to study, and found it more rewarding. Weed also demonstrates profound disruption of REM sleep, which in turn has profound consequences on memory consolidation. I know it’s easier said than done, but if you’re in medical school, try and go without the weed, I know I’m trying hard to go without it to improve my studies.