Secondhand smoke globally kills more than 600,000 people each year, accounting for 1 percent of all deaths worldwide, according to a new study. . . . Researchers estimated that annually secondhand smoke causes about 379,000 deaths from heart disease, 165,000 deaths from lower respiratory disease, 36,900 deaths from asthma, and 21,400 deaths from lung cancer. Children account for about 165,000 of the deaths, according to the researchers. . . . The study found that 40 percent of children and 30 percent of adults regularly breathe in secondhand smoke. Nationally, secondhand smoke causes 46,000 deaths from heart disease each year. . . . If the average adult produces $110,000 of output per year, how much output is lost annually as a result of adult deaths from secondhand smoke?