Quote Originally Posted by zeitgeist
I see that the first study uses injection and Granny, the study you posted uses the smoking method.
I think the second study should be taken more seriously because nobody injects themselves so there will be some varying physical effects. things

You have to remember though that IQ tests don't prove anything. It is widely accepted that IQ tests are faulty and don't actually show true intelligence, but intelligence compared to a collection of test subjects and other people your age.