The bans started happening around the same time as the Tobacco Settlement money started flowing. The boards of health in each state, along with the Robert Wood Johnson Foundation, formed Coalitions. These Coalitions started wearing brown shirts and marching with jack boots across America.
The Robert Wood Johnson Foundation told these coalitions that the more bans, control and restrictions put upon the smokers in the state, the more "grant money" the state would receive from them and the American Medical Association.
What with all the poor budgets the states have been facing, they jumped on the bandwagon to grab that money. They didn't care if they stuck it to 25-30% of the people in the state who chose to smoke a legal commodity or not. All they saw were dollar signs.