Illinois became the 20th state in the nation to allow the use of medical marijuana.
Gov. Pat Quinn signed the law Thursday and it takes effect January 1st.
The measure sets up a four-year pilot program for state-regulated dispensaries and 22 so-called cultivation centers, where the plants will be grown. Under the measure, only patients with serious illnesses or diseases will be allowed to obtain medical marijuana.
The bill lists more than 30, such as cancer, muscular dystrophy and lupus.
The patients must have established relationships with a doctor and will be limited to 2.5 ounces every two weeks. Currently, 19 other states and Washington, D.C., allow medical marijuana.