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As marijuana legalization expands in the United States, concerns about potential health risks are growing. While most users have no problems, a growing number, particularly heavy users, report addiction, psychosis and other negative consequences. Dr. Kevin Gray, a psychiatrist specializing in bio-behavioral medicine, highlights the complex nature of cannabis: “Cannabis has both therapeutic and potentially problematic effects.” The New York Times interviewed hundreds of people experiencing serious and sometimes frightening symptoms related to cannabis use. One story tells of actor David Krumholtz, who after resuming marijuana use, developed cannabinoid hyperemesis syndrome (CHS). This debilitating condition causes cycles of intense nausea…

Rwanda is currently battling an epidemic of Marburg virus disease, a rare but serious hemorrhagic fever. Since the end of September, 36 cases and 11 deaths have been reported. Although caused by different viruses, Marburg shares similarities with Ebola in transmission, symptoms and progression. The virus is initially transmitted from fruit bats to humans. Previous outbreaks have occurred in Africa, but not in Rwanda. A medical student in Germany who had contact with an infected patient in Rwanda has shown symptoms. Tests confirmed negative for Marburg, reassuring the public that there is no current risk. First identified in 1967, Marburg…