Secondhand smoke is harmful. Children exposed to secondhand smoke are at a 50 to 100% higher risk of acute respiratory illness. Say NO TOBACCO! Does Vaping Cause Secondhand Smoke? Study finds secondhand smoke may be source of lead exposure in children, adolescents Vital Record Parents' Pot Smoking Means More Colds, Flu for Kids Get Smart About Drugs 10 Strategies Big Tobacco and E Cigarette Companies Use to Target Kids American Lung Association