Previous research examining the effects of dagga on cognitive function and intelligence has yielded mixed results. Researchers hypothesized that heavy and dependent dagga use during youth may lead to a decline in Intelligence Quotient (IQ). To investigate this, a thorough review of existing studies was conducted, and their findings were combined through a process known as meta-analysis.
Researchers searched various databases for studies published until January 24, 2020, identifying seven studies meeting the criteria. These studies involved a total of 808 individuals who heavily used dagga and 5308 individuals who did not. The analysis revealed a significant association between frequent or dependent dagga use during youth and a decrease in IQ. On average, this decline amounted to approximately 2 IQ points.
The findings suggest that dagga use during youth may negatively affect intelligence. However, further research with extended follow-up periods is necessary to fully comprehend how dagga impacts brain development over time.
Read the full study at the link below: