By Dr. Brian McDonough

PHILADELPHIA (CBS) – In recent years marijuana has made a resurgence. Despite the fact that it is illegal, there are many people who believe that it should not be. But whether you consider marijuana legal or not there are health risks associated with the drug.

According to a new report in the British Medical Journal, marijuana may cause schizophrenia. Two-thousand Germans between the ages of 14 and 24 were followed for 10 years. At the beginning of the study none of them said they smoked marijuana and none of them had a history of psychosis. After following the individuals for a decade the researchers found those who reported having smoked pot where 90% more likely to report psychotic symptoms than those who did not.

The authors say since marijuana use began before the symptoms were displayed, marijuana could increase the risk of these problems. Those who argue with this study say people who are troubled may actually turn to marijuana as a form of relief.

Reported By Dr. Brian McDonough, KYW Newsradio Medical Editor

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