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Tue Jan 15, 2013, 05:26 AM

Analysis casts doubt on marijuana’s link to IQ decline


A longitudinal study that found teens who smoked marijuana had lower IQ scores in adulthood has been challenged by a researcher at the Frisch Centre for Economic Research in Norway.

In an analysis published online by the Proceedings of the National Academy of Sciences, Ole Røgeberg said the original study of almost 1,000 participants in New Zealand over nearly four decades was “flawed and the causal inference drawn from the results premature.”

The original study found those who started smoking marijuana before 18 years of age tended to score lower on IQ tests in adulthood. There was no decline in IQ for those who began smoking after 18 years of age, suggesting the teenage brain was particularly vulnerable to the drug.

However, Røgeberg found the participants’ socioeconomic status — their income, education, occupation, and family history — could explain the apparent correlation between marijuana use and decline in IQ scores.

Raw Story (http://s.tt/1yrN8)

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Reply Analysis casts doubt on marijuana’s link to IQ decline (Original post)
xchrom Jan 2013 OP
Le Taz Hot Jan 2013 #1
green for victory Jan 2013 #2
bemildred Jan 2013 #3

Response to xchrom (Original post)

Tue Jan 15, 2013, 06:42 AM

1. Important kick

because the anti-pot jihadists on this board are fond of using this study to support their views on keeping cannabis illegal. The second study clearly counters the original claim. Bookmarked.

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Response to xchrom (Original post)

Tue Jan 15, 2013, 06:49 AM

2. Don't you suspect that the Feds knew this when they applied for a patent


on the use of cannabinoids in 2003?
US FEDERAL GOVERNMENT Cannabinoid patent

Just check out the footnotes on the patent papers on the link.

They've known lots of things they pretend they didn't since 1974, at least

Pot Shrinks Tumors; Government Knew in '74 May 30, 2000

In 1974 researchers learned that THC, the active chemical in marijuana, shrank or destroyed brain tumors in test mice. But the DEA quickly shut down the study and destroyed its results, which were never replicated -- until now.

The term medical marijuana took on dramatic new meaning in February, 2000 when researchers in Madrid announced they had destroyed incurable brain tumors in rats by injecting them with THC, the active ingredient in cannabis.

The Madrid study marks only the second time that THC has been administered to tumor-bearing animals; the first was a Virginia investigation 26 years ago. In both studies, the THC shrank or destroyed tumors in a majority of the test subjects.

Most Americans don't know anything about the Madrid discovery. Virtually no major U.S. newspapers carried the story, which ran only once on the AP and UPI news wires, on Feb. 29, 2000.


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Response to xchrom (Original post)

Tue Jan 15, 2013, 08:40 AM

3. Correlation is not causation. nt

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