- Dr. John McGrath , and his colleagues at the Queensland Brain Institute in Australia studied 3,800 young adults born between 1981 and 1984 .
- Among the 1,272 young people in this study who never used marijuana, only 2 percent were diagnosed with psychosis.
- Among those who used marijuana for six or more years, 3.7 percent were diagnosed with this illness.
- Even those who used marijuana for fewer than three years were at an increased risk for mental problems.
The study comes at a time when many state legislatures are considering legalizing marijuana. The U.S. Centers for Disease Control and Prevention (CDC) has reported an increase in marijuana use among young people, many of who believe the drug is harmless.
Labels: marijuana, health problems
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