The first five years after the onset of a first episode of psychosis (FEP) are crucial for long term outcome. In this period, the risk of relapse is particularly high. Consequences of relapse include an increased risk of neurotoxicity, chronicity, hospitalization, decreased response to treatment, increased economic burden and functional impairment.

To discern the influence of cannabis on relapse as it may contribute to adopt specific measures in patients during early stages of the illness.

PAFIP is an early intervention program for patients with a FEP. Between January 2005 and January 2011, 163 patients were recruited for this study. They were followed-up during 3 years at intervals of three months. The sample was divided into three groups: (1) those non-cannabis users neither before the FEP nor during follow-up (nn), (2) consumers before the FEP and during follow-up (ss) and (3) consumers before the FEP that gave up consumption during follow-up (sn).

No statistically significant differences between the three groups were observed but a trend (P = 0.057) towards a more enduring survival in Group 3 (sn). (Kaplan–Meier curve and detailed Log Rank Test results will be included in the final poster).

Cannabis has a detrimental effect on schizophrenia. The interruption of its use could contribute to improve the outcome of the disease, as the results of our study suggest.

The authors have not supplied their declaration of competing interest.