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Swedish Military Study Linking Marijuana Use to Schizophrenia Risk
In a longitudinal study of over 45,000 Swedish military personnel followed up 15 years after conscription, individuals who had reported using marijuana at least once by the time of conscription were more than 2 times as likely to develop schizophrenia during the following 15 years than those who had never used marijuana. Individuals who had reported using marijuana 50 or more times were 6 times as likely to develop schizophrenia (Andreasson, Allbeck, Engstrom, & Rydberg, 1987).
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A large-scale, long-term study finds that adolescents who frequently use a specific psychoactive substance are significantly more likely to be diagnosed with schizophrenia in early adulthood than those who do not. Based on this finding, which of the following conclusions is the most accurate and nuanced interpretation of the relationship?
A news headline reads: 'Study Proves Marijuana Use Directly Causes Schizophrenia.' Based on the established scientific understanding of the relationship between the two, which of the following statements provides the most accurate evaluation of this headline?
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