New York Daily News, Marijuana can cause mental disorders, loss of intelligence: 20-year study

146967521Smoking marijuana can lead to mental disorders, car crashes, unhealthy babies and more problems, according to a major 20-year study. Professor Wayne Hall, a drugs advisor to the World Health Organization and professor of addiction policy at King’s College London, said that heavy, daily use can also lead to dependence and serve as a gateway to other harder drugs. Among the more startling findings in his study, published in the journal Addiction, are that people who drive after smoking marijuana are twice as likely to be in a car accident, and teens who smoke regularly are twice as likely to have impaired brain function and mental disorders as adults.

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