To conclude, our findings are relevant as they aid to shed light on the cannabis–violence association that has been less extensively studied amid psychiatric patients, in whom cannabis use is twice as prevalent in contrast to the general population. Compared to prior studies, we employed a prospective design to precisely examine the association between the continuation of cannabis use and violence. Our results are particularly relevant and may have clinical and violence risk management implications as we exposed that the persistency of cannabis use across different time waves was associated with an increased risk of violence in a large sample of patients recently discharged from acute psychiatric facilities.