Marijuana grower Basil McMahon with his crop in Grass Valley, Calif., on November 12, 2015. A sweeping new package of laws will reverse years of state silence by regulating and licensing every stage of...

Medical marijuana cigarettes are hand-rolled at the All American Cannabis Club, aka A2C2, a medical marijuana collective, in San Jose, Calif., on August 20, 2014. The Golden State, with its already outsize...