Over the years rumors have led people to believe marijuana use has a negative effect on intelligence. Two new scientific reports recently reached the same conclusion: there is no evidence that marijuana use hurts IQ.

Researchers from the Boston Medical Center and the Boston University School of Medicine looked at patients who consumed marijuana to see if it had any impact on their health. According to U.S. researchers, cannabis has no negative effects on human health and there’s no difference between people who smoke cannabis daily and those who do not.

Another survey took over 400 adult cannabis users and found that 80% gave up their prescription medications once they started using medical marijuana. In most cases many cannabis users not only gave up prescription medications, but they also stopped the use of other drugs (like alcohol). Many new studies are also confirming cannabis is an effective treatment for PSTD.