Sometimes cannabis use is associated with irritability, anger, or violence-related outcomes, but it does not reliably make everyone aggressive—and studies have not established that cannabis alone causes violence. The answer depends on whether you mean reactions during intoxication, irritability during withdrawal, or associations found in longer-term studies.
What can happen while someone is high?
Cannabis responses vary. The National Institutes of Health says cannabis may make someone feel happier or relaxed, but “It can also make people feel more irritable or restless.” Irritability or restlessness is not the same as aggression, and neither necessarily leads to violence.
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Anxiety, fear, distrust, panic, or hallucinations are more common after taking a large amount, particularly with a high-THC product or little prior experience. These effects can be relevant to a person’s behavior, but they do not establish that cannabis will make that person aggressive.
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Responses can depend on THC amount, route of use, other substances, health conditions, age, sex, genetics, and prior experience. No single factor reliably predicts how an individual will behave.
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Can stopping cannabis cause anger or irritability?
After heavy or long-term use, stopping or substantially reducing cannabis can bring withdrawal symptoms. The NIH lists trouble sleeping, decreased appetite, depressed mood, restlessness, and irritability; it notes that “Symptoms of withdrawal from cannabinoids can include being easily annoyed or angered”. These are possible symptoms, not inevitable effects, and anger does not mean someone will become violent.
An older review of drugs and aggression described cannabis as reducing the likelihood of violence during intoxication while associating withdrawal with aggressivity. That historical review should not be treated as a universal rule about how cannabis affects people now.
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What do studies say about cannabis and violence?
Reviews have found associations between cannabis use and violence-related outcomes, but an association does not prove that cannabis caused the behavior. Studies may differ in how they define use and violence, whom they include, and whether they account for other factors that could influence both.
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Studies in psychiatric populations
A 2022 systematic review by Maryam Sorkhou and colleagues found 15 eligible studies. It reported cross-sectional associations in samples of people with PTSD and a longitudinal association in psychotic-spectrum disorders. The authors said uncontrolled confounding in most included studies prevented causal conclusions and called for better-controlled longitudinal studies. Read the review abstract.
Broader violence research
A separate 2022 scoping review by Dorsa Rafiei and Nathan J. Kolla included 19 publications from 327 screened articles. It found a correlational link between cannabis use and violence among adults, with the strength varying by population; the causal nature of the link remained unclear. Read the review abstract.
A systematic review and meta-analysis by Giulia Trotta and colleagues, published September 24, 2026, reported an association between cannabis use and perpetration of violence in psychiatric and general-population samples, across both longitudinal and cross-sectional study designs. It also reported an association with victimization. The analysis covered 63 studies and 265,079 participants, with searches through November 2024. Those figures describe the studies included—not an individual’s likelihood of becoming violent. Pooled observational associations cannot establish that cannabis caused a particular person’s behavior. Read the meta-analysis abstract.
Does THC itself provoke aggression?
A 2018 review of human research reported that acute THC tended to dampen rather than provoke aggression in most studies it examined. That finding does not rule out an individual adverse reaction, and it does not answer separate questions about withdrawal or population-level associations with violence. The review also discusses synthetic cannabinoids, which are distinct from cannabis products containing THC; its findings about synthetic cannabinoids should not be applied to ordinary cannabis. Read the review.
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Cannabis use by itself cannot tell you why someone became angry or aggressive. Timing matters: a reaction during intoxication is different from withdrawal after reducing or stopping use, and both differ from the longer-term associations examined in population studies. Irritability, aggression measured in a study, and violence are also distinct outcomes.
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One 2003 review discussed evidence associating cannabis withdrawal with aggressivity, while describing a different pattern during intoxication. As an older review, it is context rather than proof of a universal effect. Read the review abstract.
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