Passive smoking, also called second-hand smoking (SHS), is the term for inhaling the sidestream smoke emitted from the end of a lighted cigarette along with the smoke exhaled by the smoker in proximity. This smoke contains more than 7,000 noxious chemicals, of which at least 70 are carcinogenic. Sidestream smoke contains 10 times higher amount of toxins than mainstream smoke. On an estimate, children whose parents smoke are exposed to as much nicotine as if they themselves had smoked 60-150 cigarettes a year.