Teen marijuana use may not lead to a lower I.Q

FOX 26 - Teen marijuana use may not lead to a decline in intelligence after all. New research suggests the link may not be as clear-cut as previously thought. Investigators report marijuana users did have lower I.Q test scores on average when compared to those who didn't use pot. However, they found when it comes to twins where one uses pot and the other doesn't, they both had about the same I.Q score.