A new strategy has emerged in the battle to ban smoking in casinos: the shareholder vote.Shareholders at Boyd Gaming, Bally's Entertainment and Caesars Entertainment will put on the ballot at the respective casino companies proposals to force the firms to study the costs associated with permitting smoking indoors — and whether going smoke-free could save money.The proposals are sponsored sponsored by Trinity Health, a nonprofit health care network, and the Americans for Nonsmokers' Rights Foundation. Trinit ...