With drug studies, some also wonder if the researchers have an ethical bias, but the author said his concern lies with the drug's high popularity level.
"I don't have any moral position, but it's important people know there are potential risks," Barber said. "There's a perception out there that cannabis is a natural substance and what's the problem about? For medicinal reasons, it's different. For cancer, it stimulates the appetite. But if you use it for recreation, you need to know the risks," Barber said.
The U.S. National Institute on Drug Abuse has more about the health effects of marijuana.
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