Cannabis retailers have once again shown why experts are calling legal marijuana markets “pandemic-proof”. March 2021 saw the highest monthly recreational marijuana sales in Illinois history, according to new data released by the state’s Department of Financial and Professional Regulation. Illinois Sells Over $109 Million of Legal Pot in March Before last month, January 2021 held the record for the highest monthly adult-use marijuana sales in Illinois history, with $88,813,872 worth of cannabis products sold. The hot start to the new year was a part of a widespread trend across the nation’s legal cannabis markets — skyrocketing cannabis sales during the COVID-19 pandemic.