Posttraumatic stress disorder and cannabis use in a nationally representative sample.

The present study examined the relations between posttraumatic stress disorder (PTSD) and cannabis use in a large representative survey of adults (N = 5,672) from the United States (Kessler et al., 2004). After adjusting for sociodemographic variables (i.e., age, marital status, ethnicity, education, income, and sex), alcohol use disorders, and nicotine dependence, lifetime and current (past year) PTSD diagnoses were associated with increased odds of lifetime history of cannabis use as well as past year daily cannabis use. Lifetime, but not current, PTSD diagnosis also was uniquely associated with increased risk for any past year cannabis use. Additional analyses revealed that the relations between PTSD (lifetime and current) and lifetime cannabis use remained statistically significant when adjusting for co-occurring anxiety and mood disorders and trauma type frequency. Overall, these findings add to the emerging literature demonstrating a possibly important relationship between PTSD and cannabis use.