(Mathew Sumner | Associated Press file photo) On Monday, Jan. 1, 2018, a customer purchases marijuana at the Harborside marijuana dispensary in Oakland, Calif., on the first day that recreational marijuana was sold legally in California. State regulators get credit for taking on the massive job of transforming the longstanding illegal and medicinal marijuana markets into a unified, multibillion-dollar industry, but the results have been mixed. Some companies are doing well, but many others are not.