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Secondhand smoke, also known as environmental tobacco smoke (ETS), is a combination of the smoke coming from the lit end of a cigarette and exhaled smoke.
Public health officials have concluded that secondhand smoke from cigarettes causes diseases, including lung cancer and heart disease, in non-smoking adults, as well as conditions in children such as asthma, respiratory infections, cough, wheezing, otitis media (middle ear infection) and sudden infant death syndrome. In addition, public health officials have concluded that secondhand smoke can exacerbate adult asthma and cause eye, throat, and nasal irritation.
The World Health Organization 
(WHO) provides information on its website which states that secondhand tobacco smoke is dangerous to health and that it causes cancer, heart disease, and many other serious diseases in adults.
As with the health effects of smoking, the public should be informed about public health officials’ conclusions on the health risks of secondhand smoke. The public should be guided by these conclusions in deciding whether to be in places where secondhand smoke is present, or, if they are smokers, when and where to smoke around others. Smokers should not smoke around children or pregnant women.