I've been smoking tons of weed since senior year of high school (currently a sophomore in college), and since I got to college I've been smoking even more and yet got a 3.9 GPA during all three of my semesters so far. I really have no clue how I'm getting so many A's. Some of the grades I've gotten have just completely baffled me considering how much I've slacked off to toke up. I don't know what's going on but hey, it's working for me.