The phrase “getting stupid,” used to refer teens getting high, may be more of a reality than those adolescent smokers think.

A joint study between a London University and Duke University found that teens who smoked pot in their adolescence, had lower IQ scores as adults.

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They were also significantly more likely to have attention and memory problems in later life, than their peers who abstained.

The study focused on data from over 1,000 people in New Zealand, who have been followed through their lives since being born in 1972 or 1973.

Participants were asked about cannabis usage when they were 18, 21, 26, 32 and 38. Their IQ was tested at 13 and 38. In addition, each nominated a close friend or family member, who was asked about attention and memory problems.

The study, published in the journal Proceedings of the National Academy of Sciences, found persistent users, those who had smoked 4 times a week or more, had dropped 8 IQ points over the 25 years from 13 to age 38.

With the recent studies of marijuana as a possible gateway drug, this study may be another strong indicator why parents need to reinforce the message that marijuana is bad for children.

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