The number of people who died of medical marijuana is rising every year in the U.S.A. and 25,760 people died from overdosing on prescription drugs, including painkillers and tranquilizers like Valium, according to CDC figures. Doctors prescribe medical marijuana to treat for example, muscle spasms, nausea from cancer. (Anne Harding, 2013). It shows medical marijuana help us from serious situation. However, there are many risks. I am going to write how dose medical marijuana work; how dose medical marijuana give us bad effects and how we use or take it in to our body.