Cannabis Use Predicted Late College Dropout Even After Accounting for Depression | Research

The takeaway

Cannabis use during freshman year predicted discontinuous college enrollment in later years, while depression predicted early enrollment gaps, suggesting different timing mechanisms for these risk factors.

Read this if you are a college student concerned about how cannabis use might affect your academic trajectory.

Cannabis predicted late (years 3-4) but not early enrollment gaps

What the researchers found

Researchers followed 1,145 college students for four years. Depression symptoms at college entry predicted early enrollment gaps (first two years), while cannabis use predicted later gaps (years 3-4). Receiving a depression diagnosis during college was associated with both early and late discontinuity.

Importantly, pre-college psychiatric diagnoses did not predict enrollment interruptions once background characteristics were controlled. This suggests that active substance use and mental health problems during college, not pre-existing conditions, drive enrollment disruption.

Why it matters

College dropout has long-term consequences for earnings, health, and life satisfaction. Understanding that cannabis use specifically predicts later enrollment gaps (not early ones) helps universities target interventions at the right time and for the right risk factors.

The numbers in context

1,145 students followed for 4 years. Depression (BDI) predicted early but not late discontinuity. Cannabis and alcohol predicted late but not early discontinuity. Depression diagnosis during college predicted both. Pre-college diagnoses: not significant after controlling for background.

How the study worked

Longitudinal study of 1,145 students at a large public university, interviewed annually for four years starting at college entry in 2004. Enrollment data from university records. Measures included BDI, BAI, childhood conduct problems, cannabis use, illicit drug use, and alcohol consumption. Multinomial logistic regression controlled for background characteristics.

What this study cannot tell us

Single university study may not generalize to other institutions. Self-reported substance use may underestimate actual use. "Discontinuous enrollment" includes both voluntary and involuntary interruptions for various reasons. Cannabis use was measured at baseline and may have changed over the study period.

How to read the evidence

Prospective longitudinal study with university enrollment data; moderate evidence with appropriate controls.

When this study was published

Published in 2013. Research on substance use and college outcomes has continued with larger, multi-institutional studies.

The bigger picture

This study demonstrates that substance use and mental health problems have distinct temporal patterns in their impact on academic outcomes. Depression disrupts earlier (perhaps through immediate motivation and functioning effects), while cannabis effects accumulate and manifest later, possibly through gradual academic decline.

Questions still open

Would targeted cannabis use interventions during sophomore and junior year prevent later dropout? Does the cannabis-dropout relationship hold at different types of institutions? Could early cannabis use screening identify at-risk students before academic problems manifest?

Common questions

Does cannabis cause college dropout?

This study found cannabis use during freshman year predicted enrollment gaps in years 3 and 4, even after accounting for depression, anxiety, and background factors. However, it cannot prove causation. Cannabis use may be part of a broader pattern of disengagement, or other unmeasured factors may contribute to both cannabis use and dropout.

Why does cannabis affect enrollment later but not earlier?

The authors suggest cannabis effects on academic performance may accumulate gradually. Unlike depression, which can immediately impair daily functioning and trigger early withdrawal, the academic consequences of regular cannabis use, such as missed classes, lower grades, and declining motivation, may take time to reach the point where enrollment is interrupted.

Read the original research

Discontinuous college enrollment: associations with substance use and mental health.

Psychiatric services (Washington, D.C.), 64(2), 165-72

View on PubMed ↗Publisher’s paper ↗

Citation

Arria, Amelia M; Caldeira, Kimberly M; Vincent, Kathryn B; Winick, Emily R; Baron, Rebecca A; O'Grady, Kevin E. (2013). Discontinuous college enrollment: associations with substance use and mental health.. Psychiatric services (Washington, D.C.), 64(2), 165-72. https://doi.org/10.1176/appi.ps.201200106