Secondhand Smoke and Children First, Second and Thirdhand Smoke: The Differences and Dangers Tobacco Stops With Me E Cigs and Second Hand Vaping: Dangers and Protections E Cig Vapor Or Secondhand Smoke: Which Is Worse For You? Second hand vaping exposure very low compared to second hand smoking UCL News UCL University College London 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.