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Medical cannabis, or medical marijuana, can refer to the use of cannabis and its cannabinoids to treat disease or improve symptoms; however, there is no single agreed-upon definition. The rigorous scientific study of cannabis as a medicine has been hampered by production restrictions and other federal regulations.[40] There is limited evidence suggesting cannabis can be used to reduce nausea and vomiting during chemotherapy, to improve appetite in people with HIV/AIDS, and to treat chronic pain and muscle spasms. Its use for other medical applications is insufficient for conclusions about safety or efficacy.
Short-term use increases the risk of both minor and major adverse effects.Common side effects include dizziness, feeling tired and vomiting.Long-term effects of cannabis are not clear.Concerns include memory and cognition problems, risk of addiction, schizophrenia in young people, and the risk of children taking it by accident.