A legal marijuana program could mean substantial revenue for Florida, according to Smart & Safe Florida, the group behind the ballot measure to legalize cannabis, otherwise known as Amendment 3, for adults. At a roundtable this week in Tampa, the organization quoted economists who estimate that legalizing marijuana could generate between $195 million and $431 million annually in sales tax revenue, proving a significant boost to the state’s economy. Florida is not unique either. Other legal weed states are doing it to the tune of $20 billion in tax revenue. Sean Shaw, a local attorney, pointed …