Secondhand smoke poses deadly health risks. Although more than 73 percent of Ohioans do not permit smoking inside their residences, many are exposed to secondhand smoke that invades from nearby apartments or through wall or floor cracks, ductwork, plumbing, wall outlets, doors or windows. Separating smokers from nonsmokers, cleaning the air, and ventilating buildings does not eliminate exposures of nonsmokers to secondhand smoke. Cigarette-caused fires are the leading cause of residential fire-related deaths in the United States, with 34 percent of those killed being children. There is no risk-free level for second-hand smoke; the only way to protect everyone is to eliminate second-hand smoking exposure. In Ohio, 71 apartment buildings have adopted a smoke-free policy to protect non-smoking residents from second-hand smoke.