The usage of medical cannabis in modern times is controversial, and in recent years the American Medical Association, the MMA, the American Society of Addiction Medicine, and other medical organizations have issued statements opposing its usage for medicinal purposes. In general, research says medical marijuana is safe and effective in controlling chronic pain, alleviating nausea and vomiting associated with chemotherapy, treating wasting syndrome associated with AIDS, and controlling muscle spasms due to multiple sclerosis and epilepsy. several studies have suggested that cannabinoids may stop many kinds of cancers from birthday cake strain and spreading, including pancreatic, lung, leukemic, melanoma, oral, lymphoma and other kinds of cancer. A significant proportion of oncologists support medical marijuana as an option for their patients. There are several species of Cannabis. They are: Cannabis sativa: A strain found in Mexico and Central South America. The sativa plant is tall with narrow, serrated leaves. It has THC - the psychoactive-inducing part of the plant - and the effects are primarily on the mind and emotions. Cannabis Indica: A strain found in Asia and India and grown in the US. The plant is short and stocky. Indica's effects are primarily physical and some emotional, including relaxation, sedation and pain reduction. Cannabis Ruderalis: This strain is also called hemp and has no THC. Cannabis Hybrid Strains: The result in cross pollination of various strains. The effects are often stronger than the original strain.