Smoking marijuana regularly (a joint a day) can damage the cells in the bronchial passages which protect the body against inhaled microorganisms and decrease the ability of the immune cells in the lungs to fight off fungi, bacteria, and tumor cells. For patients with already weakened immune systems, this means an increase in the possibility of dangerous pulmonary infections, including pneumonia, which often proves fatal in AIDS patients.

Studies further suggest that marijuana is a general "immunosuppressant" whose degenerative influence extends beyond the respiratory system. Regular smoking has been shown to materially affect the overall ability of the smoker's body to defend itself against infection by weakening various natural immune mechanisms, including macrophages (a.k.a. "killer cells") and the all-important T-cells. Obviously, this suggests the conclusion, which is well-supported by scientific studies, that the use of marijuana as a medical therapy can and does have a very serious negative effect on patients with pre-existing immune deficits resulting from AIDS, organ transplantation, or cancer chemotherapy, the very conditions for which marijuana has most often been touted and suggested as a treatment. It has also been shown that marijuana use can accelerate the progression of HIV to full-blown AIDS and increase the occurrence of infections and Kaposi's sarcoma. In addition, patients with weak immune systems will be even less able to defend themselves against the various respiratory cancers and conditions to which consistent marijuana use has been linked, and which are discussed briefly under "Respiratory Illnesses."

In conclusion, it seems that the potential dangers presented by the medical use of marijuana may actually contribute to the dangers of the diseases which it would be used to combat. Marijuana as a therapy, at least until a good deal more conclusive research has been completed concerning its debilitating effect on the immune system, is up to your consent.