For me, it was a chance for me to ask a bunch of questions of people about things I was curious about but were probably none of my business or impolite to talk about, so I suspect to some degree I was guilty of the latter one.
I will say that it was incredibly enjoyable when I took it with the people I was with, which were in mostly safe and contained environments. If the draw to both immediately do more and to seek it out weeks and months later to repeat the experience wasn't so strong, I would recommend it to everyone to try at least once. As it is, I would be cautious if trying for the first time and space out usage if you tend to overindulge and/or aren't one to naturally self-regulate.
Sounds like you were just associating with pricks and those pricks happened to use a popular drug.
They all make the same speech but Somehow they never seem to know about it when 7 people in the class got a copy of test in advance and prepared answers. For every student who's bad a cheating and got caught, there is >15 that the teacher never knew about.