Medical marijuana can refer to the use of cannabis and its cannabinoids to treat disease or improve symptoms of certain illnesses or sickness. The use of cannabis as a medicine has been scientifically tested, and the results show a very valid case as to why it should and will continue to be used. There is evidence showing that 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.
There has been sufficient data collected to prove strong conclusions about the safety of medical marijuana. Typically, adverse effects of medical cannabis use are not serious. These include tiredness, dizziness and psychoactive effects. Tolerance to these effects develops over a period of time, and the amount of cannabis normally used for medicinal purposes is not believed to cause any permanent cognitive impairment in adults. Withdrawal symptoms are rarely a problem with controlled medical administration of cannabinoids. Medical marijuana has several potential beneficial effects. Evidence is moderate that it helps in chronic pain and muscle spasms. Evidence also supports its use for reducing nausea during chemotherapy, improving appetite in HIV/AIDS, improving sleep, and improving tics in Tourette syndrome. Legalization of cannabis in some states provides a unique opportunity for even more thorough investigation into the societal and public health impact of broader cannabis use.