Cannabis use disorder (CUD) is up to ten times more common in schizophrenia (SCZ) than in the general population, and substantially worsens the course of this severe psychiatric disorder. Since SCZ occurs in 1% of the population, the comorbidity of CUD in 13% to 42% of people with this disorder presents society with an important public health problem. At present, treatments available for these "dual diagnosis" patients are inadequate. New treatments to limit cannabis use in patients with schizophrenia are sorely needed.