Back in my Junior year in high school I was in the yearbook class (I wasn't on the yearbook team per-se, we just had a class you could take as an elective). One of the things that you could do in the class was, if you had a car, you and 1 or 2 other people could go out to local businesses and try and sell advertisements in the year book. My school had a "closed campus" (You didn't get to just leave for lunch or whenever you wanted to), so this was kind of a nice deal.
One of my best friends just happened to be in the class with me. You know what that meant....

We used to get straight BLAZED in the car.
Classes were only an hour and a half, but that was more than enough time to sell an ad and have free time to do whatever.
The funny thing is, we still sold a good amount of ads (Probably more than anyone else). We would hit up a dentist office or something, get a 25 dollar check, smoke, go to wendys, and still be back in time to sign back in before the next period.
We'd see each other in Trig, still munching like crazy from getting blazed, eating snack cakes and measuring triangles and shyt.
Those were the days brehs....
Far as college goes...there was a 2 or 3 year period in undergrad when I was getting high every single day. Pure pothead (Had weed posters and shyt up). I'd smoke before classes, quizes, work-study...it was whatever. Much as I love getting high, I'm glad that I'm not into weed-culture like that anymore. Blew through a shyt ton of money on that shyt, my god, me and my homies were going through like thousands of dollars of loan money on weed/alcohol/coke.