Rich Greenberg was diagnosed with cancer a few years ago, and has suffered broken vertebra because of his condition. His daily routine included popping powerful painkillers for some relief. At one point, Greenberg was taking more than 100 pills a month. “I’ll be in chronic pain for most of my life,” said the 65-year-old resident of Mullica Hill. “I needed to get off the oxys (oxycodone).” A few months ago, he turned to pot. Greenberg is among 10,800 patients statewide, incl