SAN FRANCISCO (Reuters) - Legislators in San Francisco city voted to ban smoking in public parks on Tuesday, becoming the first major American city to embrace such an expansive ban on tobacco use. Yahoo! Health Have questions about your health? Find answers here. "This is the first one that includes all the parks and recreational centers in a county," said Michela Alioto-Pier, a city legislator who sponsored the proposed ban. It needs the approval of Mayor Gavin Newsom to become law. Several smaller California cities have already prohibited smoking in city parks, including Santa Monica and Beverly Hills, as well...