The increasing availability of high potency cannabis increases the risk of developing cannabis psychosis, as a dose response relationship has been established as a risk factor. • Defining and standardizing terms and measurement of cannabis products and use could usefully transform research and practice for cannabis psychosis.• Evidence based interventions for patients with cannabis psychosis are limited and those that show promise are symptom-specific rather than treating all symptoms.• Liberalisation of cannabis policy in some countries may support studies designed to better understand the impact of cannabis on mental health