A Randomized Pilot Trial of a Cannabis Harm Reduction e-Intervention (CHAMPS) for Young Adults With Early Psychosis Who Use Cannabis

Cannabis users who experienced a psychosis are particularly vulnerable to cannabis-related harms, which can include worse psychotic symptoms and more hospitalizations. Unfortunately, few psychosocial interventions exist that aim to decrease these harms. Instead, most focus on ceasing cannabis use which is rarely appealing to cannabis users. Furthermore, face-to-face psychotherapy often remains inaccessible to people with psychosis mostly due to lack of trained clinicians. Alternatives such as e-interventions have the potential to increase access to treatment and decrease clinicians' workload. Among cannabis harm reduction approaches are the protective behavioural strategies. These strategies do not encourage nor discourage cannabis use. Instead, they recommend behaviours for safer cannabis use. For example, these strategies include: 1) avoid driving a car under the influence of cannabis, 2) avoid mixing cannabis with other drugs and 3) purchase cannabis only from a trusted source. In the present pan-Canadian study, we will test the first e-intervention called CHAMPS (Cannabis Harm-reducing App for Managing Practices Safely) for cannabis harm reduction adapted for young adult cannabis users who experienced a psychosis. CHAMPS is a smartphone application that includes 17 strategies for safer cannabis use, a personalized consumption goal and a consumption journal. The goals of this study are 1) to confirm whether CHAMPS is acceptable to participants and 2) to test whether it works, notably by positively impacting participants' health and cannabis consumption habits.