Cigarettes do not just harm the people who smoke. They also harm the people who are near cigarettes and breathe the smoke. This includes fetuses (unborn babies still inside their mothers) and small children. They are breathing second hand smoke. Second hand smoke is the smoke that comes out of the lit end of a cigarette and that a smoker exhales (breathes out). Second hand smoke is also called passive smoke, involuntary smoke, and environmental tobacco smoke (ETS).