StudiesDATACANN is a cannabis registry which we are collaborating with. The purpose of this registry is to collect real-world data on large samples of patients with chronic non-cancer pain who are using cannabis to answer important research questions. We feel monitoring cannabis benefits and risks is very important for this medicine to be better understood . You can find more information at http://datacann.mcmaster.ca. Please click on the link below to register, the registration is voluntary.