A new study has linked marijuana use with cognitive dysfunction in people with HIV infection who have an alcohol or other drug use disorder. While researchers at Boston University School of Public Health (BUSPH) Boston University School of Medicine (BUSM) and Boston Medical Center (BMC) did not detect effects of lifetime cumulative exposure the study showed that more frequent current marijuana use was associated with a measure of cognitive dysfunction on the Medical Outcomes Study HIV Health Survey cognitive function scale. Co-author Richard Saitz noted that people with HIV infection have many reasons to have cognitive dysfunction from the virus