Recent research has found a link between cannabis use and increased violent behavior. The UK journal Psychological Medicine published findings that people who regularly used cannabis were significantly more likely to commit a violent act than non-users. They were also more likely to be a victim of a violent act. Though the research doesn’t prove a cause-and-effect link, it suggests that cannabis use might be an important and potentially modifiable risk factor for interpersonal violence.
Cannabis use is a known risk factor for adverse mental health outcomes, including psychosis, which is frequently associated with aggression. However, the specific impact of cannabis use on the risk of violence remains unclear.
THE STUDY’S METHODOLOGY
This study’s meta-analysis was conducted according to PRISMA guidelines, and synthesized evidence from 63 peer-reviewed studies. This effort was done to clarify the link between cannabis use and violence, either as a perpetrator or as a victim. In short, Random-effects models revealed that cannabis users are at a significantly higher risk of perpetrating violent acts. This association was observed in both psychiatric patients and the general population, and remained significant across both longitudinal and cross-sectional study designs.
There was an especially large effect for violence involving a criminal conviction in both general and psychiatric populations. Furthermore, cannabis use was significantly associated with an increased risk of becoming a victim of violence, a risk more pronounced in females and mixed-gender cohorts compared to males. This meta-analysis indicates an increased risk of violence, especially that resulting in a criminal conviction, among cannabis users. It also highlights the potential of cannabis use as a target for interventions to decrease violence, and underscores the need for routine assessment of cannabis use among psychiatric patients.
WHY DOES CANNABIS USE INFLUENCE VIOLENT BEHAVIOR?
According to the study, possible explanations for the association between cannabis use, particularly high doses, and violence include impairments in attention, executive function, inhibition, and problem-solving abilities. Prolonged heavy use can also influence mood and emotional regulation, including feelings of anger and hostility. Moreover, during periods of cannabis withdrawal, individuals may experience irritability, anxiety, restlessness, and impaired functioning, potentially leading to aggressiveness. Most importantly, regular cannabis use increases the likelihood of experiencing paranoia, causing individuals to interpret neutral stimuli as potentially threatening, leading individuals to believe that they must defend themselves.
In addition, cannabis users tend to exhibit higher levels of impulsivity and engage in more risk-taking behaviors, which could lead to antisocial and criminal activities as part of their lifestyle. These mechanisms represent only one component of the broader relationship between drugs and violence, which has also been conceptualized as involving psycho-pharmacological, economic-compulsive and systemic pathways. However, these psycho-pharmacological mechanisms are unlikely to fully explain the observed association.
The study also found that cannabis use frequently co-occurs with a range of individual, social and environmental factors, including impulsivity, antisocial traits, adverse socioeconomic circumstances and exposure to violent environments, that may independently contribute to violence risk. The available evidence therefore suggests that the association between cannabis use and violence is likely to reflect multiple interacting pathways rather than a single direct causal mechanism.
Please contact my office if you, a friend or family member are charged with a Drug Offense, Assault, or any other crime. Potential defenses to some crimes may include Diminished Capacity and Voluntary Intoxication. Hiring an effective and competent defense attorney is the first and best step toward justice.
