University of Minnesota survey links regular marijuana use to lower grades

College students who use marijuana regularly have lower grades - whether or not they think it affects them, according to a first-of-its-kind analysis of Minnesota student survey data.

Mean grade-point averages dropped from 3.33 to 3.01, comparing male students who didn't use marijuana at all with students who used it daily. The comparable gap for female students was 3.4 to 3.18.

http://www.startribune.com/university-of-minnesota-survey-links-marijuana-to-lower-grades/506125982/