Secondhand (or second hand) smoke is the involuntary exposure to tobacco smoke. While many of the health effects of active smoking occur in older ages, the effects of secondhand smoke can affect all ages, including children and unborn babies. There is sufficient evidence to implicate secondhand smoke in Sudden Infant Death Syndrome (SIDS), impaired lung function, and lung cancer, among many other health problems. Exposure to secondhand smoke is more common in lower socioeconomic groups.


Secondhand Smoke Exposure by Socioeconomic Status

Exposure to secondhand smoke is more common in lower socioeconomic groups. Further, tobacco products other than cigarettes may substantially contribute to secondhand smoke exposure in some populations

Exposure to secondhand smoke (%) from cigarettes and hookah among Iranian children by father’s education level, ages 6-18, 2011-2012