It took a little while - but it looks like the medical marijuana market in Illinois is taking off in a big way. According to the latest numbers from Marijuana Business Daily, monthly medical cannabis sales in the state hit $2.2-million in April alone.

About 3,200 patients qualified for medical marijuana cards when sales first kicked off in November. There are currently 35 qualifying conditions for medical marijuana in Illinois, from multiple sclerosis to fibromyalgia and Tourette's syndrome. April saw the addition of 15 new ailments to the list, including chronic pain.

The addition of new qualifying conditions might have contributed to the near-doubling of patients in the state to 6,200 as of last month. Patients are permitted to possess 2.5 ounces of cannabis per two-week period.

It's estimated that 700 to 800 new patients are joining the program each month. If more qualifying conditions are added to the list, it's likely the state's medical market will see even more growth.

The 83 percent increase in sales since January means that the state is likely to hit as much as $25-million in medical sales this year.

Check out the chart from the Marijuana Business Daily below, or read the full analysis here.