Marijuana is also known as pot, grass and weed but its formal name is actually cannabis. It comes from the leaves and flowers of the plant Cannabis sativa. It is considered an illegal substance in the US and many countries and possession of marijuana is a crime punishable by law. The FDA classifies marijuana as Schedule I, substances which have a very high potential for abuse and have no proven medical use. Over the years several studies claim that some substances found in marijuana have medicinal use, especially in terminal diseases such as cancer and AIDS. This started a fierce debate over the pros and cons of the use of medical marijuana. To settle this debate, the Institute of Medicine published the famous 1999 IOM report entitled Marijuana and Medicine: Assessing the Science Base. The report was comprehensive but did not give a clear cut yes or no answer. The opposite camps of the medical marijuana issue often cite part of the report in their advocacy arguments. However, although the report clarified many things, it never settled the controversy once and for all.