There are two types of receptors in our body that allows us to take in the effects of medical cannabis - CB1 receptors that are found primarily in the brain, spinal cord, and periphery and CB2 receptors that are found on the immune tissues [source: McCarberg, Bill M.D.]. When coming into contact with cannabis, our body produces molecules (called endocannabinoids) that interact with these CB1 and CB2 receptors which produces the euphoric state that helps to dull our senses to various symptoms [source: McCarberg, Bill M.D.].
One common use of medical cannabis is to ease the symptoms of nausea. In trials conducted by National Cancer Institute, two FDA-approved cannabis-based drugs, dronabinol and nabilone, helped to reduce chemotherapy-related nausea and vomiting in cancer patients. When taken orally, the drugs "worked as well as or better than some of the weaker FDA-approved drugs to relieve nausea and vomiting" [source: National Cancer Institute].