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The decline in the intellectual capacity of aaaa marijuana Canada

The decline in the intellectual capacity of marijuana lovers in their youth, as recently reported in scientific papers, can be explained by adverse social circumstances, not by the effect of this drug on brain cells.

In August 2012, a group of scientists led by Madeleine Meyer from Duke University in Durham (USA) found that the use of marijuana in youth is accompanied by decreased mental ability. They calculated that systematic drug use resulted in a decrease in IQ of 8-10 points in adult life.
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Norwegian sociologist Ole Rogeberg from the Ragnar Frisch Center for Economic Research in Oslo doubted the validity of these findings and re-analyzed the data on marijuana use in the New Zealand town of Dunedin, which Meyer and her colleagues used in their article.

In this city since the 1980s, a long-term and extensive sociological study, which involved more than a thousand citizens born in 1972 and 1973. In particular, in the course of this study, city services measured the IQ of its participants at the age of 13 years, and regularly conducted anonymous surveys on the use of marijuana in youth and adulthood.

According to Rogeberg, Meyer and her colleagues made several methodological mistakes in studying the statistics collected by Dunedin's social services. According to him, their analysis lacked many important variables, including the socio-economic status of New Zealanders and their ethnicity, which could distort the results of the study.
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In particular, the majority of marijuana lovers in this city come from poor families with a stable low income. Rogeberg notes that other statistical studies have repeatedly shown that poor people are more likely than wealthy people to use marijuana systematically.

With this idea in mind, the author of the article has tried to find the relationship between material situation and intellectual disability in statistics. For this purpose, he divided the Dunedin inhabitants into several groups depending on their socio-economic status and watched how their IQ changed.

The comparison showed a striking difference in the fall in IQ between rich and poor New Zealanders. On average, the IQ of poor people decreased slightly more than that of wealthy people in Dunedin. Rogeberg does not attribute this phenomenon to the use of marijuana, but to the fact that poor people did not have the means or desire to continue their education after school and their work implied low levels of intellectual activity.

According to the scientist, his findings clearly show that marijuana use was not the only or determining cause of IQ decrease in some Dunedin residents. According to him, the most probable reasons for this phenomenon were the typical risks that accompany poverty - unemployment, constant contact with crime, lack of education and other socio-economic factors.