Marijuana-often called pot, grass, reefer, weed, herb, Mary Jane, or MJ-is a greenish-gray mixture of the dried, shredded leaves, stems, seeds, and flowers of Cannabis sativa-the hemp plant. Nowadays people used to perceive marijuana as a light drug for relaxing and having some fun, and most of the time they don't think about what consequences it can bring into their life.
To make my personal opinion if marijuana can be as a medical option I did some exploratory researches and what I found shocked me in not really good way! According to the http://www.drugabuse.gov/: "By the time when children graduate from high school, about 46 percent of teens will have tried marijuana. The use of marijuana can produce adverse physical, mental, emotional, and behavioral effects." So in my opinion there is a big problem how easy to get that drug and how many young people can destroy their health just for looking "cool" among their peers.
On the other hand Wiki tells us that medical cannabis (or medical marijuana) appears to be somewhat effective for the treatment of chronic pain, including pain caused by neuropathy and possibly also that due to fibromyalgia and rheumatoid arthritis. Therefore, people who are suffering terrible pain every day, marijuana could really help to make life easier. That explains why 20 states of America (as of March 2014) have legalized marijuana's use for certain medical conditions.
Weighing the pros and cons I have to admit that in severe cases, medical marijuana can be used, but the treatment should be entirely under the supervision of a physician, and only on the hospital grounds.