Secondhand Smoke Second hand E cigarette Vapour Increases Risk Of Poor Respiratory Health Study Finds Cigarette Smoke Detector Secondhand vape exposure detectable in children's saliva, breath Contemporary Pediatrics Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London Scientists Warn Against Breathing in Secondhand Vape 'Smoke' Newsweek Second Hand Vaping: Minimal Impact Compared to Smoking