Smoked every day in college, but *never* in class. Only once at work, gave my friend a ride in the morning & he shared. Ruined my whole morning at work. Computer programmer, couldn't concentrate.

Senior year in high school, I had lunch, band, 2 study halls, then physics. No problem smoking lunch. Band was great, then 2 more hours to come down before a "real" class.

During my 2 study halls, I read Einstein's papers on relativity and a bunch of college books on topology, tensor algebra and gauge theory. Being high made the 4-dimensional stuff so vividly clear. I could not even do simple arithmetic when high, but somehow the symbolic stuff just leaped off the page.