Secondhand Smoke and Secondhand Vaping: Both Bad for Kids University Hospitals Secondhand marijuana smoke and kids Harvard Health Is Second Hand Vape Harmful Children At Risk: Emory Study Uncovers The Hidden Dangers Of Secondhand Vape Exposure Second Hand Vaping Vs Smoking 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.