second-hand smoke


Smoke from the burning end of any tobacco product (cigarette, cigar or pipe) or exhaled by a smoker.

Environmental tobacco smoke contains over 4000 chemicals, 50 of which are known to be carcinogenic (cancer causing) or are associated with an increased risk for developing cancer and heart disease.

Also called environmental tobacco smoke (ETS) or passive smoke. Inhaling second-hand smoke is called passive smoking.