Quote Originally Posted by CountFloyd View Post
As I said, I can only go on personal experience. Clearly there can be no evidence either way.
Now why would you say that when there's

GOOGLE TO THE RESCUE!!!

http://www.nickpagan.com/blog/117/mu...duces-your-iq/
Attempting to carry out multiple of tasks simultaneously just doesn’t suit the way that our brains work. In fact, research shows that multitasking reduces your intelligence more than smoking pot (I could have given you the link here, but then you would have to multitask and lose attention, so I’ve put it at the end of the article for you =) ).
http://www.scienceblog.com/community.../20021645.html
Fried and colleagues followed 70 subjects in the Ottawa Prenatal Prospective Study, and compared intelligence quotient (IQ) scores of subjects at 9--12 years of age (before initiation of marijuana use) with their scores at 17-20 years. The authors grouped subjects as nonusers (n= 37), light users (less than 5 joints per week, n=9), former users of marijuana (no marijuana use in at least 3 months, n=9) or heavy users.

The authors found that among heavy users (more than 5 joints per week, n=15) IQ scores decreased by 4.1 points on average, while gains in IQ scores were seen among light users (mean 5.8 points), former users (mean 3.5 points), and nonusers (mean 2.6).

The authors state that while there was a significant decline in IQ scores, the scores of the subjects -- at a mean of 109.1 -- were still above average at the young adult assessment (mean 105.1). They add that if preteen IQ had not been assessed, the subjects would have appeared to be functioning normally. The authors suggest further investigation into the cognitive consequences of both current and previous marijuana use, particularly since the popularity of the drug has been increasing over the last 4 years.
http://norml.org/index.cfm?Group_ID=5105
Marijuana smoking, even long-term, does not harm intelligence, according to findings published this week in the Canadian Medical Association Journal.