boston massachusetts governor charlie baker friday sign bill raise tax retail sales recreational marijuana 20 percent 12 percent rate propose successful 2016 ballot initiative state one eight unite state legalize use drug adults 21 old marijuana possession legalize dec. 15 2016 retail sales drug remain illegal jan. 2018 delay intend give state local authorities time decide regulate trade baker republican oppose legalization several senior state officials voice concern future sign law support worry terribly consequences baker tell reporters appreciate careful consideration legislature take balance input lawmakers educators public safety officials public health professionals honor voters regard adult use marijuana law also allow cities towns ban limit marijuana sales create five-member cannabis control commission responsibility oversee sale recreational medical marijuana measure approve voters call legal retail sales drug begin july state legislators push date back six months allow time develop regulations legalization backers protest delay call state officials move quickly appoint new control commission state benefit greatly tax revenues job create new industry confident lawmakers secure appropriate fund get regulatory system run current timeline say jim borghesani spokesman regulate mass support ballot initiative massachusetts governor sign bill hike tax recreational pot