Secondhand Smoke Second hand E cigarette Vapour Increases Risk Of Poor Respiratory Health Study Finds Cigarette Smoke Detector 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 vaping may pose risk to your kids: New study Secondhand Smoke Is Dangerous To Children Label NHE 19601 Reverse Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London