FILE - This April 15, 2017 file photo shows marijuana plants for sale at the ShowGrow dispensary a medical marijuana provider in downtown Los Angeles. California's struggling legal cannabis industry is expected to grow next year to $3.1 billion, but it remains far outmatched by the state's thriving illegal market. A report released Thursday, Aug. 15, 2019, finds consumers are spending roughly $3 in the state's underground pot economy for every $1 in the legal one. (AP Photo/Richard Vogel,File)