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NEW YORK (AP) — A new analysis is challenging the idea that smoking marijuana during adolescence can lead to declines in intelligence.
Instead, the new study says, pot smoking may be merely a symptom of something else that's really responsible for a brainpower effect seen in some previous research.
It's not clear what that other factor is, said Joshua Isen, an author of the analysis. But an adolescent at risk for smoking pot "is probably going to show this IQ drop regardless of whether he or she is actually smoking marijuana," said Isen, a lecturer in psychology at Loyola Marymount University in Los Angeles.
For the new work, the researchers examined data that had been collected for two big U.S. studies of twins. They focused on 3,066 participants who were given a battery of intelligence tests at ages 9 to 12 — before any of them had used marijuana — and again at ages 17 to 20.
They tracked changes in the test scores and studied whether those trajectories were worse for marijuana users than for non-users. Most tests revealed no difference between the two groups, but users did fare more poorly than abstainers in tests of vocabulary and general knowledge.
If smoking pot harmed test scores, the researchers reasoned, people who'd smoked more pot should show poorer trends than those who'd smoked less. But that's not what the data revealed. Among users, those who'd smoked more than 30 times or used it daily for more than a six-month stretch didn't do worse.
The study also looked at 290 pairs of twins in which one had used marijuana and the other had not. The members of each pair had grown up together and 137 sets were identical twins so they shared the same DNA. Again, the pot users did not fare worse than their abstaining twin siblings.
So, the researchers concluded, pot smoking itself does not appear responsible for declines in test scores. Isen noted, however, that the work says nothing about other potential harmful consequences of smoking marijuana in adolescence.
users did fare more poorly than abstainers in tests of vocabulary and general knowledge.
For the study, roughly 9,000 participants were surveyed at age 42 on their drug use, and then surveyed again at age 50, and were tested using various cognitive functioning tests. Researchers found that those who had a history of, and currently used illicit drugs (with cannabis by far being the most popular), performed either as well, or better in these test.
Researchers found that “A positive association was observed between ever (past or current) illicit drug use and cognitive functioning.”
originally posted by: TechniXcality
a reply to: Krazysh0t
Krazyshot this is the one area, i offer zero retort and agree with you 100%, the amount of hysteria about drugs (and i do not limit it to just pot) is mind numbing. I support a legalization of all drugs, and decriminalizing and also more support centers for rehabilitation in the event of addiction.