Secondhand Smoke Kills More Than $600,000$ People a Year: StudySecondhand smoke globally kills more than $600,000$ people each year, accounting for $1$ percent of all deaths worldwide, according to a new study.Researchers estimate that "passive smoking" causes about $379,000$ deaths from heart disease, per year, worldwide. Passive smoking also kills $165,000$ people each year due to lower respiratory disease, $36,900$ deaths from asthma, and $21,400$ deaths from lung cancer.Children account for about $165,000$ of the deaths. Forty percent of children and $30$ percent of adults regularly breathe in secondhand smoke.Source: World Health Organization.How much global output is lost annually as a result of adult deaths from secondhand smoke if the average adult produces