Tagged: Marijuana

Research supported by Duke University scientists linking marijuana use to a drop in I-Q is being questioned. 

Last August researchers at Duke published a study that followed habitual users of marijuana in New Zealand before they turned 18. Subjects of that study showed an average drop of eight I-Q points when their aptitude was measured. 

Duke University researchers say there's evidence that early marijuana use has a negative impact on intelligence. The study examined routine cannabis users who began smoking before the age of 18. On average, subjects showed an 8-point drop in I-Q when measured at age 13 and then again at 38. Madeline Meier worked on the study and says that drop is significant.