In November, Californians will again consider whether to legalize pot, this time with Proposition 64, the Adult Use of Marijuana Act. Voters will have to ask themselves whether the time has come to treat marijuana less like heroin and more like alcohol — as a regulated but acceptable product for adult use. Do the risks of legalization outweigh the costs of prohibition? Does Proposition 64 strike the right balance between allowing adult Californians to make their own recreational choices and protecting their health and safety?