Chicago (AP) – More than 4,000 people used medical cannabis to treat PTSD, about 3,400 treated fibromyalgia and 2,500 people treated cancer. Other common qualifying conditions are spinal cord disease and injuries, traumatic brain injuries and post-concussion syndrome, rheumatoid arthritis and multiple sclerosis. Medical marijuana use is up more than 80 percent in Illinois, with PTSD as the most common condition treated, according to a report by the state Department of Public Health. More than 46,000 people have used medical marijuana in Illinois this year, The Chicago Tribune reported . Almost 75 percent of patients are more than 40 years old.