It's to control the nausea associated with high-dose pain medication and chemotherapy, and to help with the anxiety of having a large bore needle put in your vein every few days for chemo administration, and you know, the anxiety that is associate with the fear of dying a painful death, and dealing with your friends and family having to deal with your dying a painful, prolonged death.
It also helps people eat. Anorexia is very common because of the nausea and other side effects of chemo and cancer drug cocktails and HIV/AIDS cocktails. So "the munchies" gets these folks to eat, even just small amounts, and keep their already weakened immune systems going a bit stronger than if they weren't eating anything at all.
But pro-prohibition people don't care about that, because they only think that people that smoke pot are doing it to get high. PS: most people who are users of medical marijuana, especially cancer patients, ingest their cannabis through baked goods or in "pills" (crushed marijuana or hash in a tablet that is easily ingested or sprinlked on food or drink).
Keep on fighting for people who are dying, though, and getting any relief they can! 
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