Cannabis Users Were More Willing to Work for Rewards, Contradicting the "Amotivational Syndrome" Idea

Greater cannabis use days and cannabis use disorder symptoms predicted increased likelihood of selecting high-effort trials on the EEfRT, even after controlling for ADHD symptoms, distress tolerance, income, and delay discounting. This finding directly contradicts the "amotivational syndrome" hypothesis that regular cannabis use impairs goal-directed behavior.

Cross-sectional study comparing 25 cannabis-using college students (68% meeting CUD criteria) and 22 non-users. Participants completed the Effort Expenditure for Rewards Task (EEfRT), which measures willingness to expend effort for varying reward magnitudes and probabilities. Generalized estimating equation models controlled for multiple confounders.

The idea that cannabis makes people lazy has persisted for decades despite mixed evidence. This study adds to growing research suggesting the "amotivational syndrome" may not hold up under controlled testing, which matters for reducing stigma around cannabis use.

If cannabis does not reduce motivation in laboratory settings, the observed real-world associations between heavy cannabis use and lower achievement may reflect other factors (socioeconomic status, mental health, educational access) rather than a direct pharmacological effect on motivation.

Small cross-sectional sample of 47 college students limits generalizability. Laboratory effort tasks may not capture real-world motivation. Cannabis users were tested when not acutely intoxicated. Selection bias: college students who use cannabis may be a uniquely motivated subgroup.