(I) The most commonly used illegal drug in the US is marijuana. (II) Its potential for serious health consequences is still debated, but few authorities regard it as a major health risk. (III) In fact, a recent study found no increased death rates for marijuana users, except for men who died of AIDS. (IV) Moreover, marijuana has been used medically to treat glaucoma and to prevent the vomiting and nausea associated with chemotherapy. (V) Although this study does not determine cause and effect, it seems safe to assume that marijuana did not cause death from AIDS, but rather that men receiving a diagnosis of AIDS may have subsequently increased their use of marijuana.