Among 1,618 recently trauma-exposed civilians, people who already used cannabis or alcohol heavily had worse PTSD and depression symptoms at baseline, with symptoms peaking around 8 weeks before declining.
Trauma clinicians, PTSD researchers, emergency medicine professionals, and addiction specialists
1,618 trauma-exposed civilians tracked for 12 weeks
What the researchers found
Using latent class mixture modeling, researchers identified three trajectory classes for both alcohol and cannabis use: low, high, and increasing use. High cannabis users had significantly worse PTSD and depression symptoms at baseline compared to low users. All groups showed symptom increases peaking at week 8 followed by decline at week 12.
Why it matters
Understanding how substance use patterns relate to post-trauma mental health trajectories could help clinicians identify who is most at risk for developing chronic PTSD and depression after a traumatic event.
The numbers in context
1,618 participants (1,037 female); three trajectory classes per substance (low, high, increasing use); PTSD and depression symptoms peaked at week 8 across groups; symptoms declined by week 12
How the study worked
Longitudinal study of 1,618 trauma-exposed civilians (1,037 female) recruited from emergency departments. Self-reported alcohol and cannabis use and clinical symptoms were assessed at baseline and at 2, 8, and 12 weeks posttrauma. Latent class mixture modeling identified substance use trajectories.
What this study cannot tell us
Self-reported substance use; 12-week follow-up may be too short to capture long-term trajectories; cannot determine whether substance use causes worse symptoms or whether shared risk factors drive both; emergency department recruitment may not represent all trauma-exposed individuals
How to read the evidence
Large multi-site longitudinal study with sophisticated trajectory modeling, though limited by self-report and 12-week follow-up.
When this study was published
2024 study
The bigger picture
The finding that pre-existing substance use patterns predict post-trauma symptom severity and trajectories supports the idea that substance use may reduce resilience to trauma, creating a self-reinforcing cycle.
Questions still open
- Would early intervention targeting substance use in trauma-exposed individuals improve PTSD outcomes? Why did symptoms peak at 8 weeks, and does this timing window offer a critical intervention opportunity?
Common questions
How did cannabis use affect recovery from trauma?
Did some people increase substance use after trauma?
Read the original research
Associations of alcohol and cannabis use with change in posttraumatic stress disorder and depression symptoms over time in recently trauma-exposed individuals.
Psychological medicine, 54(2), 338-349
Citation
Hinojosa, Cecilia A; Liew, Amanda; An, Xinming; Stevens, Jennifer S; Basu, Archana; van Rooij, Sanne J H; House, Stacey L; Beaudoin, Francesca L; Zeng, Donglin; Neylan, Thomas C; Clifford, Gari D; Jovanovic, Tanja; Linnstaedt, Sarah D; Germine, Laura T; Rauch, Scott L; Haran, John P; Storrow, Alan B; Lewandowski, Christopher; Musey, Paul I; Hendry, Phyllis L; Sheikh, Sophia; Jones, Christopher W; Punches, Brittany E; Kurz, Michael C; Swor, Robert A; Hudak, Lauren A; Pascual, Jose L; Seamon, Mark J; Datner, Elizabeth M; Chang, Anna M; Pearson, Claire; Peak, David A; Merchant, Roland C; Domeier, Robert M; Rathlev, Niels K; Sergot, Paulina; Sanchez, Leon D; Bruce, Steven E; Miller, Mark W; Pietrzak, Robert H; Joormann, Jutta; Pizzagalli, Diego A; Sheridan, John F; Harte, Steven E; Elliott, James M; Kessler, Ronald C; Koenen, Karestan C; McLean, Samuel A; Ressler, Kerry J; Fani, Negar. (2024). Associations of alcohol and cannabis use with change in posttraumatic stress disorder and depression symptoms over time in recently trauma-exposed individuals.. Psychological medicine, 54(2), 338-349. https://doi.org/10.1017/S0033291723001642
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