I play viola and I find that if I smoke just before I practice or just before a lesson I can focus better and I usually learn quicker. This applies to a lot of other things, too. Recently I went into class really blazed, found out we were having a test that day (I turned to the guy next to me and said, "Duuuuude! What the hell is this test on??") and I ended up getting a 97 when everyone else got Cs and Ds. I feel like I can focus better, also class becomes more interesting when I'm stoned.