Researchers confirm for first time that using the drug may lead to rise in crimes.
A new study now says that cannabis users are more likely to commit violent crimes.
The project is the first of its kind to demonstrate that cannabis is not only linked with violent crime but is the root cause of it as well.
According to researchers cannabis usage causes violence. They found no evidence that the link is the other way round.
The academics said the effect of cannabis use was clear and not diminished by other factors such as patients who were heavy drinkers of alcohol.
The study comes post a series of American states having decriminalised cannabis, despite it being stronger and more potent that the hash smoked by hippies in the sixties. The move was backed by a number of influential figures including Richard Branson, Sting and former Deputy Prime Minister Nick Clegg.
The study, by five researchers from institutes from Montreal, Canada, found out that patients who were using cannabis were nearly two-and-a-half times more likely to have turned to violence than those who had not used the drug.
The study, thus, pointed towards the adverse effects of cannabis use on violence.
Researchers further pointed out that the link between cannabis and violence was not two-way but ‘uni-directional.’