Argument: Marijuana improves immune system functions in patients with HIV
Donald Abrams, M.D., et al. "Short-Term Effects of Cannabinoids in Patients with HIV-1 Infection". Annals of Internal Medicine. August 19, 2003 - "Patients receiving cannabinoids [smoked marijuana and marijuana pills] had improved immune function compared with those receiving placebo. They also gained about 4 pounds more on average than those patients receiving placebo."