Environmental tobacco smoke (ETS) is commonly called secondhand smoke. Smoke from the burning end of cigarettes, pipes or cigars and smoke exhaled from smokers contains more than 4,000 toxic substances, more than 40 of which are known to cause cancer in humans and animals.
Exposure to secondhand smoke, also called involuntary smoking or passive smoking, is concentrated indoors where ETS is often the most significant pollutant. Indoor levels of the particles you may inhale (the "tars" in the cigarettes) from ETS often exceed the national air quality standard established by the Environmental Protection Agency (EPA) for outdoor air.
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