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The academic impacts of alcohol and marijuana, the two most commonly abused substances on college campuses, have not been studied in depth. These researchers recruited freshmen from two colleges and examined academic performance and monthly patterns of alcohol and marijuana use for 2 years (4 semesters).
Based on consumption patterns, 1138 students were categorized into three clusters:
Cluster 1: no or low users of both substances (43%; men, 38%)
Cluster 2: moderate-to-high alcohol plus no-or-low marijuana users (41%; men, 37%)
Cluster 3: moderate-to-high users of both (16%; men, 54%)
Extremely few students had heavy marijuana use combined with minimal alcohol use. Group membership remained relatively stable across all semesters. Cigarette smoki…