Argument: Marijuana damages the immune system; risky for HIV/AIDS sufferers
U.S. Institute of Medicine Report. Marijuana and Medicine: Assessing the Science Base. March, 1999 - "The most compelling concerns regarding marijuana smoking in HIV/AIDS patients are the possible effects of marijuana on immunity. Reports of opportunistic fungal and bacterial pneumonia in AIDS patients who used marijuana suggest that marijuana smoking either suppresses the immune system or exposes patients to an added burden of pathogens. In summary, patients with preexisting immune deficits due to AIDS should be expected to be vulnerable to serious harm caused by smoking marijuana."