Scientist Debunks Her Earlier Study That Claimed Weed Causes Brain Harm


A common 2012 study claimed that teen pot use was connected to lowered IQ points. That similar researcher just released a new study, even so, and it contradicts her earlier operate.

Back in 2012, Madeline Meier and a group of Duke University researchers released a study claiming that people who applied cannabis in their early adolescence suffered an typical deficit of eight IQ points compared to non-customers. This study was extensively publicized by the media, and cannabis prohibitionists and conservative parents alike applied it as “proof” that smoking weed does certainly kill brain cells

The scientific neighborhood was not so swift to accept these findings as reality, even so. A critique of the study, published in the Proceedings of the National Academy of Sciences, recommended that the IQ variations had been a lot more most likely explained by socioeconomic variations amongst the study’s participants, and not weed use

It is effectively recognized that people from wealthier financial backgrounds have a tendency to score greater on IQ tests than these from poorer communities, and critics concluded that the study failed to take these variations into account. The critique concluded that the researchers might have overestimated the influence that pot use had on intelligence, and that the “true impact [of cannabis exposure] could be zero.”

Seven years later, Meier took a fresh appear at the subject, supported by a group of researchers from the University of Pittsburgh and Arizona State University. They also received partial funding from the federal government. This new study, published in the Drug and Alcohol Dependence journal, concluded that adolescent pot use does not impair the improvement of the brain — contradicting Meier’s 2012 study.

Meier’s group examined information from the Pittsburgh Youth Study, a longitudinal study that often checks on 1,009 boys considering the fact that the mid-1980s. Primarily based on the boys’ self-reported cannabis use involving the ages of 13 to 19, the researchers divided the subjects into 4 groups: infrequent or non-customers “desisters” who decreased their pot use more than time “escalators” who elevated their use and chronic or frequent customers.

Researchers then performed structural MRI tests on 181 of the subjects when they reached the ages of 30 to 36, and compared the final results amongst these 4 groups to identify if cannabis users’ brains had been substantially diverse than non-customers. The study reports “no variations in adult brain structure for boys in the diverse adolescent cannabis trajectory subgroups.” In addition, the study located that boys who applied cannabis heavily had comparable brain volumes and thickness to boys who never ever applied pot.

“The patterns of cannabis use generally observed in neighborhood-dwelling adolescents do not seem to have lasting effects on brain structure, as we located no association involving prospectively-assessed adolescent cannabis use and subcortical brain volume and cortical brain volume and thickness in adulthood,” the authors concluded.

“These information replicate earlier operate to reveal that even some of the most frequent customers of cannabis do not show adjustments later in brain structure,” mentioned Mitch Earleywine, Professor of Psychology at the State University of New York at Albany and NORML Advisory Board Member. “The measures are really sensitive and the researchers looked all through the brain really completely. Let’s hope that these findings mitigate some of the alarmist cries that have as well frequently persisted and dominated this narrative.”

Other research that attempted to prove a connection involving cannabis use and developmental brain impairment have failed to conclusively do so. A 2017 study reported a hyperlink involving pot use and hippocampal atrophy, but a later study found that alcohol, not pot, was really accountable for this harm. One more Duke University study from 2016, and an international study from final year, also confirmed that pot is not related with cognitive impairment or brain abnormalities.

“These findings ought to be reassuring to these concerned about the public overall health implications of youth cannabis exposure,” mentioned Paul Armentano, Deputy Director of NORML, in an e-mail to MERRY JANE. “They should really support to assuage fears that cannabis’ acute effects on behavior might persist extended just after drug ingestion, or that it might pose higher possible dangers to the creating brain.”

A single once again, the worry mongering propaganda of the Reefer Madness-era proves to be unfounded. And, though it is most effective to proceed with caution, the common takeaway right here is that cannabis has fairly no (significant) repercussions on creating brains.

“That mentioned,” Armentano continued, “regulators, politicians, and public overall health advocates ought to stay vigilant with regard to the furtherance of policies that discourage youth use and access, such as the imposition and enforcement of age restrictions on cannabis sales, as effectively as the promotion of policies that limit the promoting of cannabis items in a manner that might be in particular attractive to young men and women.”

So, even although cannabis is not going to lead to lasting harm, the plant should really nonetheless be kept away from youngsters. Unless, of course, it is required for healthcare motives. 


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