--- title: "Marijuana Linked to Rampant Violence" description: "In a meta analysis of cannabis-related studies, scientists found a link between cannabis use and an \"increased risk of violence.\"" date: "2026-10-12" modified: "2026-10-12" authors: - name: "Victor Tangermann" job_title: "Senior Editor" link: "https://futurism.com/authors/victor.md" url: "https://futurism.com/health-medicine/marijuana-linked-to-violence" categories: - "Brain" - "Developments" - "Health & Medicine" - "Mental Health" - "Studies" --- # Marijuana Linked to Rampant Violence ![A photo illustration of blood splatter and marijuana plants.]() *Shutterstock / Futurism* While the recreational use of marijuana is usually associated with a more peaceful mental state, scientists just a made a surprising discovery. As detailed in a [meta analysis]() of cannabis-related studies published last month in the journal *Psychological Medicine*, a team of scientists in the UK discovered a significant link between cannabis use and an "increased risk of violence." The headline finding was that they found cannabis users were statistically more likely to be the perpetrators of violent acts. They also found that the use of the drug — particularly among women and mixed-gender cohorts — was "significantly associated with an increased risk of becoming a victim of violence" as well. While it's a classic case of correlation, not causation — the researchers stop far short of suggesting the drug directly motivates users to be more violent as we're far from reaching a scientific consensus on the matter — the findings "underscore the importance of addressing this issue at both a societal and clinical level," according to the paper. In other words, it's a highly nuanced and complex relationship with plenty of other factors at play. "As a clinician, I've seen how heavy cannabis use can be a factor in violence," said coauthor and King's College London professor Marta Di Forti in a [statement](). "We've been cautious for a long time about how far we could go in describing this link, but a review of this size lets us speak with more confidence about the risks, while being careful not to stigmatise people who use cannabis more broadly." "As cannabis becomes more commercialized and legalised around the world, the conversation about its risks has focused mostly on the person using it," added coauthor and King's College London professor of psychiatric research Sir Robin Murray. "This review shows that violence, both committing it and experiencing it, needs to be part of that conversation too." For their paper, the researchers examined 63 cannabis-related studies, involving just over 265,000 subjects. The researchers found that cannabis users "may place themselves in risky situations," which could help explain the "increased vulnerability" to violence. Users may also be exposed to "peers who engage in substance use or criminal activities." The risk of violence was also more pronounced among psychiatric patients. Previous resarch has found that people who already suffer from pre-existing mental conditions such as psychosis may experience "poorer clinical outcomes" through continued cannabis use. "Given the higher rate of cannabis use among individuals with severe mental disorders compared to the general population, this group represents a particularly at-risk population in terms of violent behavior," the paper reads. The researchers offered some key takeaways from their findings. At the societal level, the researchers suggest that "violence should be considered alongside other established cannabis-related harms when developing prevention strategies, public education campaigns, and regulatory policies." At the clinical level, the research highlights the "necessity for mental health professionals to routinely assess cannabis use in individuals presenting with violent tendencies, particularly among those with severe mental illness." However, to get a better picture of how cannabis use relates to violence, future studies will need to "disentangle causal pathways" by diving into how, why, and when people use the drug in more detail. Other studies should also "examine whether reducing cannabis use through clinical or public health interventions leads to reductions in violent behavior," the researchers conclude. **More on marijuana:** [*Research Suggests the Older You Get, the More Weed You Should Smoke*]() ## Author I've been at Futurism since 2017, where my role has evolved to encompass design, writing, and increasingly editing. I've always been fascinated by space exploration and advanced transportation, which I've leaned into by interviewing luminaries in those fields while closely following the dimensions of policy and regulation that allow next-generation projects to succeed -- or, sometimes, to fail. I'm also keenly interested in the effects of generative AI on society, policies, and democratic institutions, as well as clean energy, physics and biology, and the vagaries of tech leadership. My work for Futurism has been cited by publications including Ars Technica, Gizmodo, PC Magazine, Jalopnik, Fox News, and the New York Post. I spent my childhood living in locations including Manila, the Philippines, and Geneva, Switzerland, attended McGill University, and now live in Toronto, Canada. Before Futurism I worked at AskMen and a small photography studio. In my free time, I'm an avid gardener, foodie, and craft beer lover, as well as a maker of artisanal hot pepper sauces. I have a magnificent dog named Freida. ### Author social links [Bluesky]()