Cannabis Use Disorder Worsens PTSD — And 'Psychological Inflexibility' Is the Bridge Between Them

Cross-sectional mediation analysis of 336 college students who completed self-report measures of cannabis use disorder symptoms, psychological inflexibility, and PTSD symptom severity. Mediation model tested whether PI mediated the CUD → PTSD pathway.

One in five college students uses cannabis monthly and 10% develop CUD. College students also have high rates of trauma exposure. If psychological inflexibility is the bridge between CUD and PTSD, therapies like ACT that directly target inflexibility could be a two-for-one intervention — improving both cannabis use patterns and PTSD symptoms through a single mechanism.

This completes the PTSD-cannabis clinical cluster alongside RTHC-00116 (PTSD predicts substance use over time), RTHC-00117 (cannabis users still benefit from PTSD therapy but attend less), and RTHC-00101 (cannabis-assisted psychotherapy). The psychological inflexibility mechanism provides the 'how' — cannabis becomes an avoidance tool that prevents trauma processing, creating a self-reinforcing cycle. The solution isn't just reducing cannabis use; it's increasing psychological flexibility through targeted therapy.

Cross-sectional design — cannot establish temporal ordering (does CUD cause PI which causes worse PTSD, or does PTSD cause PI which drives CUD?). Self-report measures in a college sample may not generalize to clinical populations. The 54% variance explained is impressive but may partly reflect shared method variance (all self-report). College students represent a specific demographic and developmental stage. The mediation model is correlational, not causal.