Study: Marijuana Not Linked With Long Term Cognitive Impairment http://healthland.time.com/2011/07/19/study-marijuana-not-linked-with-long-term-cognitive-impairment/ The idea that “marijuana makes you dumb” has long been embodied in the stereotype of the slow, stupid stoner, seen in numerous Hollywood movies and TV comedies and going unquestioned by much of American culture. But a new study says no: the researchers followed nearly 2,000 young Australian adults for eight years and found that