Study finds secondhand smoke may be source of lead exposure in children, adolescents Vital Record Sleeping baby safety tip: Keep baby's environment smoke and vape free. Secondhand smoke in areas where a baby sleeps or spends time, like home or the car, increases the risk of health problems. Second hand e cigarette vapour increases risk of poor respiratory health, study finds Nursing in Practice Health Problems Caused by Secondhand Smoke Smoking and Tobacco Use CDC Secondhand vape plumes could form lung damaging radicals American Chemical Society