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Twin Study: Marijuana Does Not Affect Human Intelligence

Many people say that marijuana (also known as cannabis) usage have a negative impact in the brain of individuals. There are others who say Marijuana intake is not good for the stimulation process because they believe there are great unpleasant effects that it renders to the IQ of a person. While some say, marijuana can even affect the intelligence capacity of the person who takes marijuana. Let that hearsay be answered by this study made by investigators and researchers.

Los Angeles, California: The use of the cannabis has no negative effects in the intelligence decline of the adolescents. Somehow, it has no direct effect on the IQ. This is according to the longitudinal data that is published in proceeding of the National Academy of Sciences.

The investigators of the University of California, Los Angeles and University of Minnesota had conducted an evaluation determining whether the marijuana use is associated with the changes in the intellectual performance in the two longitudinal cohorts of the adolescent twins or not. They have an on hand application of the marijuana to real individuals to see the result of the study. The participants are assessed for the intelligence at the age of 9 to 12 years old, before marijuana involvement, again at age 17 to 20 years old.

The researchers had reported that there is no dose response relationship found between the IQ decline and cannabis use. The researchers also seen that there are no differences existing in the performance of the marijuana subjects if they will be compared to the non-using twins. They had made the study very clear and have obtained accurate and satisfying result. This study simply shows that no effects occurred in both parties.

The investigator had concluded “In the largest longitudinal exams of the IQ change and marijuana use, we had found a little evidence to suggest that the adolescent use of marijuana has a direct effect in the intellectual decline. The lack of the dose response relationship and the absence of the differences in the discordant siblings had lead us to the conclusion. We concluded that the deficits that are observed in the marijuana users are blamed for the confounding factors that can influence both IQ and substance initiations than a neuro-toxic marijuana effect”. These statements had perfectly said it well and perhaps, it is true when we refer to its state.

The findings are following the publication of the separate longitudinal study on the Journal of Pharmacology that concluded that the cumulative use of marijuana for adolescent is not associated with poorer educational performance or lower IQ once the adjustments are made for the potential confounders like in cigarette smoking. Now, perhaps, the effects that marijuana usage can give to the adolescents when it comes to their intelligence or IQ capacity has been clear to all. What affects the most are the factors that adolescent usually encounter in the community they are living in. A poor educational performance should not be blamed on something. Instead, proper guidance and care is needed for a better IQ.

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