Should I Be Concerned About Secondhand Vaping? Protect your kids from the harmful effects of secondhand smoke because no child should have to wish their clothes didn't smell like smoke. The Hidden Dangers of Secondhand Cannabis Smoke for Children Medical Health Associates of Western New York Secondhand smoke is harmful. Children exposed to secondhand smoke are at a 50 to 100% higher risk of acute respiratory illness. Say NO TOBACCO! Secondhand Smoke and Children Secondhand smoke and vape can trigger your child's asthma attacks. Smoking and vaping are unhealthy for everyone but especially harmful for people with asthma. Whether at home, in the car, or