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What is the relation between processing speed and cannabis use in schizophrenia? 


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Cannabis use in schizophrenia is associated with slower processing speed in patients experiencing their first episode of psychosis (FEP) . However, the relationship between cannabis use and processing speed in schizophrenia is still controversial, as some studies have found no significant association . Additionally, the interaction between cannabis use and genetic factors, such as the Catechol-O-Methyltransferase (COMT) gene, may influence processing speed in schizophrenia patients . Specifically, individuals with the COMT Val/Val genotype and a history of cannabis use showed worse performance on processing speed tasks compared to those with the Met allele . Overall, more research is needed to fully understand the complex relationship between cannabis use and processing speed in schizophrenia, including the role of genetic factors and the timing and pattern of cannabis use .

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The provided paper does not directly address the relation between processing speed and cannabis use in schizophrenia.
The provided paper does not mention anything about the relationship between processing speed and cannabis use in schizophrenia.
The paper found a significant interaction between cannabis use and COMT genotype on processing speed in patients with chronic schizophrenia.
The paper states that in patients with first episode psychosis, heavy cannabis use during the previous year is associated with slower processing speed.

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