no no no its not the weed..... it you.... Ive smoked weed for 6 years years now and I my self looked at notes in the past for hours before and did not learn anything... its because I was just looking at the notes, not reading them seriously, and did not know how to study.... it was not the weed ... it was just that I did not know how to study correctly... try reading your notes... saying them outloud... test other people with your notes... have them test you... read a note and say it in your head over and over until you remember it.. and once I learned better studying skills I realized that the weed did not affect my studying at all... its just that I did not know how to study... so I reccomend looking for better ways to study that works for you and dont blame the god blessed herb. (p.s dont study while high though.... it can become frustrating... only do it sober, but once your done studing smoke a fatty)