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There is no sound, direct ranking of cannabis versus alcohol as a cause of violence in the available evidence. Experiments suggest that acute alcohol can increase aggression in some laboratory settings; a large meta-analysis finds cannabis use associated with violence, but that association does not establish that cannabis caused it. The studies examine different populations, time frames and outcomes, so their numbers cannot be compared as though they measured the same risk.
What the evidence says about each substance
Alcohol: experimental evidence about acute aggression
A 2016 meta-analysis by Crane and colleagues pooled 22 experiments in which researchers examined male-to-female aggression paradigms. It found a small average effect of acute alcohol consumption on aggression overall (d = .36). The reported effects were d = .32 for sexual-aggression paradigms and d = .45 for intimate-partner-aggression paradigms.
Because the studies experimentally manipulated alcohol consumption, they offer evidence that alcohol can have a causal, short-term effect on aggression under the conditions tested. But these were laboratory paradigms, not measurements of how often real-world assaults occur. The experiments covered studies conducted from 1981 to 2014 and focused on male-to-female aggression; the results should not be generalized to every person, setting or form of violence.
Cannabis: a broad association, not proof of cause
A 2026 systematic review and meta-analysis by Trotta and colleagues included 63 studies and 265,079 participants. It synthesized research on cannabis use and violent outcomes published through November 2024. The review found higher odds of violence perpetration among cannabis users in both general-population and psychiatric samples, as well as higher odds of victimization.
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In general-population samples, the pooled odds ratio (OR) for cannabis use and violence perpetration was 2.05 (95% CI 1.74–2.41). In psychiatric samples, it was 2.49 (95% CI 1.72–3.61). These are pooled associations in the populations represented by the included studies, not estimates that apply to every cannabis user. An odds ratio is not a direct statement of an individual’s probability of violence.
In the review’s longitudinal studies, the pooled association between cannabis use and violence perpetration was smaller: OR 1.17 (95% CI 1.07–1.28). Following participants over time helps clarify sequence, but it does not by itself rule out confounding or prove that cannabis caused a later violent outcome. The review also found an association with violence victimization (OR 1.49, 95% CI 1.38–1.60), making clear that its outcomes included being exposed to violence, not only perpetrating it.
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Why the findings do not produce a head-to-head winner
| Research feature | Alcohol evidence | Cannabis evidence |
|---|---|---|
| Main design | Experimental alcohol administration in laboratory aggression paradigms | Meta-analysis of varied real-world studies, largely observational |
| Timing | Acute alcohol consumption and short-term aggression | Patterns of cannabis use measured across different study periods |
| Outcomes | Male-to-female laboratory aggression, including sexual and intimate-partner paradigms | Violence perpetration and victimization across included studies |
| What the estimate represents | Standardized experimental effect sizes (d) | Pooled odds ratios (ORs) describing associations |
| Central limitation | Laboratory effects are not real-world incident probabilities | Association does not establish causation, and estimates vary by population and design |
The alcohol effect sizes and cannabis odds ratios answer different questions. Putting d = .36 beside OR 2.05 would not show which substance is more likely to lead to violence: the measures are different, and so are the study designs, samples and outcomes. The evidence supports a limited causal conclusion about acute alcohol in the tested laboratory settings and a substantial observational association between cannabis use and violence. It does not support an overall ranking.
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Intimate-partner violence and other context
Both substances appear in research on intimate-partner violence (IPV), but that does not resolve which has the stronger link. A synthesis of family-violence research found alcohol use related to IPV across clinical, community and service settings, while also emphasizing the role of other influences. A 2022 review of cannabis-related harms to others described a moderately positive association between cannabis use and physical and partner violence, with possible elevation for intensive use.
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These findings do not make substance use a standalone explanation for IPV. Relationships, social circumstances, other substance use and individual vulnerabilities can all complicate the observed link. A focused 2020 review of cannabis and violence likewise noted that findings are heterogeneous, that earlier meta-analyses found a moderate association, and that more frequent use may be more strongly associated with violence. It called for stronger longitudinal research that accounts for confounders, including other substance use; those points are cautions about the evidence, not settled causal mechanisms.
How to interpret the cannabis association
- Association is not causation. Cannabis use may precede violence in some studies, but shared vulnerabilities or circumstances can contribute to both. A statistical link alone cannot identify the cause.
- Population matters. The psychiatric-sample estimate is not a forecast for all cannabis users, and the general-population estimate is still a pooled result from the studies included—not an individual prediction.
- The outcome matters. Perpetration and victimization are distinct. An association with being victimized should not be described as evidence that cannabis users perpetrated violence.
- Use patterns may matter. Reviews have raised the possibility of stronger associations with more frequent or intensive cannabis use, but the evidence does not establish a universal threshold or mechanism.
In a 2022 scoping review, Kolla and colleagues summarized the limitation this way: “Results suggest that there is a link between cannabis use and violence; however, this relationship is strictly correlational.”
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What is known about using alcohol and cannabis together
Simultaneous use is a separate question from comparing either substance on its own. A 2025 systematic review covered 30 day- and event-level articles on simultaneous alcohol and cannabis use. It found mixed results for acute negative consequences when simultaneous-use occasions were compared with single-substance occasions. That review does not provide a direct, violence-specific comparison, so its findings cannot establish that co-use increases violence.
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- Check whether the claim concerns an experimentally tested acute effect or an observational association.
- Look for the population and outcome: a laboratory aggression measure, criminal conviction, IPV, perpetration and victimization are not interchangeable.
- Check whether the study separates substance use from other relevant factors and establishes when use occurred relative to the outcome.
- Be wary of comparing an odds ratio with a standardized effect size, or treating either as an individual’s probability of violence.
Without a matched comparison using comparable populations, exposure measures and violence outcomes, a claim that cannabis or alcohol is categorically more likely to cause violence goes beyond what these findings establish.
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