Use of alcohol and marijuana does impact academic performance.
The two most commonly used substances on college campuses are alcohol and marijuana. Researchers followed freshmen from two collages for two years, tracking academic performance and monthly use of alcohol and cannabis. The lowest users of both substances maintained the highest GPAs, and had the lowest depression scores when compared to those with moderate to high alcohol but no marijuana use or moderate to high users of both. Grades improved with lower substance abuse!
PositiveTip: Going for the gold academically? Stay away from alcohol and marijuana.