Benefits Of Marijuana . The greatest amount of evidence for the therapeutic effects of cannabis relate to its ability to reduce ; chronic pain, nausea and vomiting due to chemotherapy, and spasticity which relates to multiple sclerosis . Also, Cannabinoids are the active chemicals in medical marijuana and are similar to chemicals the body produces similar to ; appetite, memory, movement, and pain . Moreover , cannabis can help alleviate anxiety and calm users down. Furthermore, Multiple sclerosis can be painful, and cannabis provides relief for it. Multiple sclerosis leads to painful muscle contractions and cannabis can help reduce that pain. Another one of the many health benefits of cannabis is that there is no doubt cannabis is much safer than alcohol.