I typed in this great detailed response completely writing down everything I wanted to say about ganja (from the Netherlands *), but I accidentally deleted it while I was getting a fake account for SDN.
I guess I'll give you a summary:
Do it on Friday afternoon, back to normal [motor and mental] function 99.1-100% by Sunday afternoon/evening. Saturday is a bit weird - grogginess is noticeable until you take an aspirin+caffeine. After that you don't really notice impairment that much.
By Monday you're 100% back to normal.
So, if you have a low intensity weekend its a fun thing to do. Its a lot like travelling - when you are exploring a new city.
Its highly valuable to do just for the insightful experiences you get from it that you can carry with you into sobriety as well. They have really helped me in many ways.
The first couple of times you get high, its too exciting to offer those pensive moments that allow you to think about things from a new perspective and gain important personal break-throughs in understanding things relevant to your own life/environment. By the third time, it really pays off from that aspect.
Some people, pre-meds included, are incredibly ignorant and extremely ego-centric. Don't get high around these people - it may make you hate them.
I am in my third year now and have managed okay so far (~3.85) and still am doing well after having spent some time with cannabis. I won't be doing it for the rest of the semester b/c of exams being more tightly packed now... But I will be doing it again soon after.
Final note: If you know who may have wrote this please do not message it to anyone else, reveal who it is, or anything of the sort, but do let me know if you know me that you have seen this (if you want to).
Peace.
