A new study on cannabis has found that users with mental illness present an increased risk of violent behavior.

The research conducted by the Institut en Santé Mentale de Montréal (Montreal Institute of Mental Health), studied 1,136 patients – from 18 to 40 years of age – with mental illnesses who had been seen five times during the year after discharge.

And while previous research has already shown a link between cannabis and aggressive behavior, this new study found that users who continued to smoke at each follow-up appointment increased their risk of violence by 144 percent.

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