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To clarify that final point, the authors of the BJPsych Advances review noted that researchers found an elevated risk for schizophrenia among smokers, even after adjusting for confounding factors such as comorbid cannabis use, socioeconomic status, and history of parental psychotic disorder and parental substance use disorder. Implications for Treatment The studies cited in this article strongly suggest that quitting smoking and moderating caffeine use can yield significant benefits for people who have been diagnosed with schizophrenia

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Additionally, the crosssectional design used in the study means that only a snapshot of data is collected at one point in time, making it difficult to establish causal relationships between variables