A new Dutch study has observed significant associations between psychosis vulnerability and cannabis use at all assessments. Also, cannabis use at age 16 predicted psychosis vulnerability at age 19. Furthermore, psychosis vulnerability at ages 13 predicted cannabis use at, respectively, ages 16 and 19.

Conclusions:
Cannabis use predicts psychosis vulnerability in adolescents, and vice versa which suggests that there is a bi-directional causal association between the two.

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Link between pot, psychosis goes both ways in kids

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