Secondhand smoke affects 2.7B people, causes 1.66M deaths annually

A Lancet Public Health study quantifies the global burden of secondhand smoke: 2.7 billion people exposed, 1.66 million deaths per year, with women and children most affected, particularly in Southeast Asia and Africa. The figures are estimates from modeling, not direct surveillance, and the study's methodology is not detailed in this report. This underscores a persistent public-health challenge and may inform tobacco-control policy in high-burden regions.