Daily use of high-potency cannabis is associated with more positive symptoms in first-episode psychosis patients: the EU-GEI case-control study.
Diego QuattroneLaura FerraroGiada TripoliCaterina La CasciaHarriet QuigleyAndrea QuattroneHannah E JongsmaSimona Del PeschioGiusy Gattonull nullCharlotte Gayer-AndersonPeter B JonesJames B KirkbrideDaniele La BarberaIlaria TarriconeDomenico BerardiSarah TosatoAntonio LasalviaAndrei SzökeCelso ArangoMiquel BernardoJulio BobesCristina Marta Del BenPaulo Rossi MenezesPierre-Michel LlorcaJose Luis SantosJulio SanjuánAndrea TortelliEva VelthorstLieuwe de HaanBart P F RuttenMichael T LynskeyTom P FreemanPak C ShamAlastair G CardnoEvangelos VassosJim van OsCraig MorganUlrich ReininghausCathryn M LewisRobin M MurrayMarta Di FortiPublished in: Psychological medicine (2020)
Our findings provide the first large-scale evidence that FEP patients with a history of daily use of high-potency cannabis present with more positive and less negative symptoms, compared with those who never used cannabis or used low-potency types.