SACRAMENTO -- California regulators became the first in the nation today to designate second-hand tobacco smoke as a "toxic air contaminant,'' placing it in the same category as the poisons arsenic and benzene. The state Air Resources Board decided to target environmental tobacco smoke after evaluating studies that linked other people's smoke to increased cases of breast cancer, heart disease, asthma and low birth-weight babies. The designation will trigger investigations around the state. Air board staffers are expected to visit clusters of smokers outside buildings and other spots where smokers congregate. They want to figure out ways to reduce the...