Among 238 deployed military personnel, PTSD symptoms were uniquely associated with past-week cannabis use, while combat exposure and moral injury specifically predicted prescription drug misuse — revealing distinct pathways to different substance use patterns.
Military psychologists, VA substance use counselors, combat-related PTSD researchers, and military health policy makers.
What the researchers found
Higher PTSD symptom scores were uniquely associated with past-week cannabis use (vs. no use), while combat exposure and moral injury were uniquely associated with misuse of prescription opioids, sedatives, and both combined. Hazardous alcohol use (46.2%) was predicted by combat exposure.
Why it matters
Understanding that different military experiences drive different substance use patterns — PTSD→cannabis, combat/moral injury→prescription misuse — can guide targeted intervention strategies.
The numbers in context
N=238; 21% opiate misuse; 25.6% sedative misuse; 16.4% both; 14.7% cannabis use; 46.2% hazardous alcohol; PTSD uniquely predicted cannabis; combat exposure + moral injury predicted prescription misuse; combat predicted hazardous alcohol
How the study worked
Cross-sectional survey of 238 US military personnel with one or more deployments (71% male, mean age 33.3), using multivariable multinomial logistic regression examining combat exposure, moral injury, PTSD, and pain as predictors of substance use patterns.
What this study cannot tell us
Cross-sectional design; convenience community sample; self-report measures; relatively small sample; cannot determine if cannabis use is self-medication for PTSD or coincidental; no assessment of cannabis for therapeutic PTSD use.
How to read the evidence
Well-designed multivariable analysis parsing distinct psychosocial predictors, but small cross-sectional sample limits causal inference.
When this study was published
Published 2026; reflects current military substance use landscape.
The bigger picture
Military substance use is not monolithic — the specificity of PTSD-cannabis and moral injury-prescription drug pathways suggests that treating the underlying psychological wound matters more than addressing substance use generically.
Questions still open
- Are military personnel using cannabis specifically to self-medicate PTSD? Would PTSD-focused treatment reduce cannabis use? Should military substance use programs differentiate between combat-related and PTSD-related pathways?
Common questions
Why do military personnel use cannabis?
How common is substance use in the military?
Read the original research
Substance use in Military Personnel: Associations with Combat Exposure, Moral Injury, Posttraumatic Stress Disorder and Pain.
Journal of drug education, 55(1), 3-20
Citation
Kelley, Michelle L; Gabelmann, Jeffrey M; Strowger, Megan; Hearton, John; Folivi, Folly; Bravo, Adrian J; Noh, Jinjoo; Kuskye, Kristin; Haber, William; McGuire, Adam P. (2026). Substance use in Military Personnel: Associations with Combat Exposure, Moral Injury, Posttraumatic Stress Disorder and Pain.. Journal of drug education, 55(1), 3-20. https://doi.org/10.1177/00472379251394435
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