Blood will be drawn to measure levels of C-reactive protein (CRP). Urine samples will be collected at during each of the 3 study phases to monitor abstain from drugs of abuse, except for medical marijuana used less than four times a week. Samples will be collected by nurses at the VA Clinical Studies Unit and analyzed by the VA lab. Blood samples will be taken at the same time to be analyzed for C-reactive protein. Remaining blood will be banked to be analyzed for genetic factors.