The risks of passive smoking have always been known. But new research findings published in American Journal of Public Health, combining data from 22 studies on workplace smoking exposure, confirm the association between passive smoking in the workplace and an increased risk of lung cancer. The research was led by University of Illinois epidemiologist Leslie Stayner. Stayner and colleagues statistically analysed data from 22 studies measuring workers’ levels and duration of exposure to passive smoke and their risk of lung cancer.They found a 24% increase in lung cancer risk among people exposed to passive smoke in the workplace. Workers who were highly exposed had a 100% increased risk of lung cancer, and workers with a long history, or duration, of exposure to passive smoke had a 50% increased risk. So, if your office has not banned smoking at the workplace yet, do wave the findings of this new study.