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The Institute of Medicine concluded in its Mar. 1999 report titled "Marijuana and Medicine: Assessing the Science Base":

“The profile of cannabinoid drug effects suggest that they are promising for treating wasting syndrome in AIDS patients. Nausea, appetite loss, pain, and anxiety are all afflictions of wasting, and all can be mitigated by marijuana. Although some medications are more effective than marijuana for these problems, they are not equally effective in all patients. A rapid-onset (that is, acting within minutes) delivery system should be developed and tested in such patients. Smoking marijuana is not recommended. The long-term harm caused by smoking marijuana makes it a poor drug delivery system, particularly for patients with chronic illnesses.”

Mar. 1999 - “Marijuana and Medicine: Assessing the Science Base”