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Research: Cannabis use little impact on long-term cognitive abilities

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Study: Cannabis use has little impact on long-term cognitive abilities

A XNUMX-year study of sets of identical twins with different cannabis habits found no evidence of a significant long-term impact on cognitive skills due to cannabis use.

A recently published University of Minnesota study of twins aged 11 years to adulthood suggests that cannabis use has little impact on long-term cognitive abilities, according to an Associated Press report on the study. The 20-year study followed 2.410 sets of identical Minnesota twins, 364 of whom had different cannabis use, making them eligible for the study.

The study, which is still ongoing, observes cognitive, mental health and socioeconomic outcomes of cannabis use. The twins received a baseline measurement every two years, including an electroencephalogram where the twins are also asked to self-report on topics such as the frequency of their cannabis use and the physical effects.

Very little evidence for dramatic effects on cognitive ability

Dr. Jonathan Schaefer, postdoctoral fellow at the Institute for Child Development (ICD) at the University of Minnesota, said the researchers have so far concluded that "There is very little evidence that cannabis has dramatic effects on cognitive ability, at least from adolescence into early adulthood".

Dr. Steve Malone, the study's co-author, said that while the twins who use more cannabis meet the criteria for more mental health problems, fare worse in terms of socioeconomic status and score slightly lower on vocabulary tests, those results are not directly linked. to cannabis use. Rather, the results suggest that adolescent cannabis use can cause educational or motivational problems that can affect academic and occupational status later in life.

The researchers found that 76% of the twins who were heavier cannabis users continued to attend school after high school, compared with 82% of the lighter or sober twins. The mean between the siblings differed on average by about 0,2 points, it turned out.

Representing the sample of twins, cannabis has no dramatic effects on cognitive ability (Fig.)
The sample of twins is representative, cannabis none dramaeffects on cognitive ability (afb.)

Malone noted that “the sample of twins is representative of the population of the entire state of Minnesota. Researchers at the University of Colorado at Boulder also conducted an additional study that can be used to compare the results in both states, allowing researchers to observe the impact of legalization on substance abuse.

Sources including Drugabuse (EN), GanjaPreneur (EN), NCBI (EN), Science Direct (EN)

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