What is secondhand smoke?
Secondhand smoke is a combination of the smoke produced from a burning cigarette and the smoke exhaled by the smoker. Second-hand smoke is also known as passive smoke or environmental tobacco smoke (ETS). Such environmental tobacco smoke (ETS) can be easily recognized by its distinctive odor as it contaminates the air and gets retained in clothing, curtains and furniture, etc. Many people, who are not into smoking, find ETS unpleasant, annoying, and irritating to the eyes and nose.
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