Is Secondhand Vaping Harmful To Your Health? What is Thirdhand Smoke? Thirdhand Smoke Resource Center 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. The Dangers of Vaping and Second Hand Smoke to Children The health risks of secondhand smoke are widely understood. But what about secondhand vaping? E Cigs and Second Hand Vaping: Dangers and Protections