The 5 Biggest Lies About PotAnd How to Rebut Them
1. Consuming marijuana lowers intelligence.
“The best evidence is that you lose, if you use marijuana as a teenager regularly, eight IQ points. I don’t know about the rest of the table, but I don’t have eight (IQ points) to lose.” —Washington Post columnist Ruth Marcus, July 27, 2014
DRUGS
The 5 Biggest Lies About Pot—And How to Rebut Them
No, smoking marijuana doesn't lower your intelligence.
By Paul Armentano / AlterNet March 20, 2017
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Photo Credit: Eric Limon / Shutterstock
1. Consuming marijuana lowers intelligence.
“The best evidence is that you lose, if you use marijuana as a teenager regularly, eight IQ points. I don’t know about the rest of the table, but I don’t have eight (IQ points) to lose.” —Washington Post columnist Ruth Marcus, July 27, 2014
The source of this oft-repeated claim is a 2012 longitudinal study by Madeline Meier and colleagues that associated the persistent use of cannabis prior to age 18 with lower IQ at mid-life. However, a separate review of Meier’s data, published in the same journal, disputed any direct link between cannabis use and declined IQ. That review argued that Meier’s team had failed to properly control for potential confounding factors, such as subjects’ socio-economic status. After accounting for these variables, the author theorized that the “true effect (on early onset cannabis use and IQ) could be zero.”
more: http://www.alternet.org/drugs/top-five-marijuana-myths?akid=15330.260941.se7pq2&rd=1&src=newsletter1074173&t=20
= new reply since forum marked as read
just now. There are some other things going on, it seems. I don't think the marijuana issue is on too many people's minds today, really. 
