"In humans, immune suppression is subtle and in many cases insignificant. There is little evidence for cannabinoid immunosuppression as a causative agent in disease."

Lynn, A.B., and Herkenham, M. (1993) "Localization of Cannabinoid Receptors and Nonsaturable High-Density Cannabinoid Binding Sites in Peripheral Tissues of the Rat: Implications for Receptor-Mediated Immune Modulation by Cannabinoids" Journal of Pharmacology and Experimental Therapeutics, 268:3 1612-1623. pg. 1620.