Risk factors for cannabis use disorders and cannabis psychosis in Japan: Second report of a survey on cannabis-related health problems among community cannabis users using social networking services.
Neuropsychopharmacology reports March 1, 2023 Yuji Masataka, Takeshi Sugiyama, Yoshiyuki Akahoshi et al.
Among 3142 Japanese cannabis users surveyed online in 2021, those who started using cannabis at a younger age, had a family history of mental health problems, had psychiatric disorders before using cannabis, or used cannabis products other than dry flower were more likely to develop cannabis use disorders. Cannabis psychosis was linked to younger age at first use and family history of mental health problems. The causal direction of these associations remains unclear.