The findings
Real talk: a new, massive review from King’s College London just dropped, and it’s sparking some serious conversation about cannabis. Researchers looked at 63 studies involving over 265,000 people to see if there’s a link between cannabis use and violence. The results? People who use cannabis were found to be about twice as likely to commit a violent act compared to those who don’t. For people already in psychiatric care, that number jumped to two and a half times as likely.
More than just the perpetrator
The study didn't just look at who is dishing out the violence—it also looked at who is experiencing it. The researchers found that cannabis users were about one and a half times as likely to be victims of violence, with the link appearing even stronger for women. When looking at criminal records specifically, the study found users were three to four times more likely to have a conviction for a violent act. The study was recently published in the journal Psychological Medicine.
But hold up, what does it mean?
Before you panic or make assumptions, the researchers are very clear: this is an association, not proof that cannabis causes violence. It’s giving “correlation doesn't equal causation.” Many people who use cannabis are also dealing with other factors—like alcohol, other drug use, or tough life circumstances—that can also increase the risk of violent behavior. It’s a messy picture, and these outside factors play a huge role.
Also, most of the data in these 63 studies is from a time before high-potency cannabis was everywhere. Experts say we don't really know how today's much stronger weed products might change the equation, lowkey making it a space to watch for future research.
Why it matters
As weed gets legalized and commercialized globally, we need to have the full picture on health risks. The researchers aren't trying to stigmatize anyone, but they do think public health messaging and mental health screenings should start including questions about cannabis use. It’s all about being informed and safe, because real talk, the conversation around cannabis risks has been pretty limited until now.
