Breathing either mainstream or sidestream tobacco smoke is called passive smoking. Demonstrate ingredients in tobacco smoke. Show students the tar-stained handkerchief and explain that the tar present in tobacco smoke created the stains. Remind students that this tobacco smoke had already been in the lungs of the smoker before being exhaled. Sidestream smoke is more harmful to nonsmokers than mainstream smoke, because sidestream smoke has not had any tars or other chemicals removed by the smoker's lungs.
Students read about effects of environmental tobacco smoke.
Environmental Tobacco Smoke Have students read the student page. Brainstorm effects of environmental tobacco smoke. Ask students to brainstorm other ways that environmental tobacco could affect their family, their friendships, the workplace, the health care system, insurance rates, etc. Smoking kills more people every year than all other drugs combined, including alcohol. Smoking alters normal structure and function of the body, as seen in premature wrinkling, diminished ability to smell and bone loss leading to osteoporosis.