I smoke before one of my classes in college and one only. Philosophy. Oh man does that stuff bug me out. I get sooo stoned before class (first class of the day at 2:00 ) and when the teacher starts to lecture I just trip out to what he's saying. Descarte, Hume, lots of crazy thinking that really makes you wonder. SOmetimes, it's impossible to concentrate on the ideology of the lectures but I love it.