In general, after using marijuana a person experiences a sedating effect, which makes the drug less likely to cause violence in users than other substances such as alcohol and stimulants (e.g., amphetamines and cocaine).
However, sometimes when marijuana is used it can cause fear, anxiety, panic or paranoia, which can result in an aggressive outburst. For most people, however, once the effects of the drug wear off, their behaviour gradually improves.
Studies show that violence can occur more often among people who use marijuana regularly, rather than those who use it occasionally or not at all. It is unclear why this is the case, but it may be because people with violent tendencies can also have a range of other psychosocial problems and are therefore more likely to use marijuana. marijuana is also part of the illegal drug market, which may increase the chances of violence occurring in some social interactions.
Research also shows that marijuana users who commit violent acts usually have a history of violence before they start using the drug.
In addition, when people are withdrawing from marijuana they can be irritable, which can lead to abusive or aggressive behaviour.