In regards to Marijuana and its medical value, proponents of legalization believe that Marijuana meets the FDA criteria as a substance in which the benefits outweigh its risk. This is considered to be a guiding principle when the FDA makes a decision towards approving a substance for medicinal use.arijuana is created when the leaves and female flowers of the hemp plant are dried, and it is commonly used but not limited to use in cigarette form. THC or Tetrahydrocannabinol is the primary intoxicant of marijuana. Aside from the technical, there are a few legal terms as well.