Folks who grow and use medical marijuana should be all in favor of legalization, right? Not so fast. Some people who legally grow marijuana under compassionate use provisions of California law are concerned that if Prop 19 passes in November, collectives will no longer be able to cultivate large plots of land and patients will suffer. How would broad-based legalization of marijuana impact medical growers and users? Who’s for Prop 19 and who opposes it?