Cannabis Potency Effects on Brain White Matter in Early Phase Psychosis

Metformin will be prescribed, reaching 1000mg/day (a standard dose). This will be done under the principal investigator's care and the patient's clinical team, including assessment of metformin adherence. Metformin will be prescribed for 6 months. Antipsychotic treatment will continue as per standard of care (metformin as adjunct therapy), as well as routine follow up.