Parents using e cigs expose kids to dangerous secondhand vapor Futurity Second hand smoke is highly toxic. Here's what happens when pregnant women and their babies are exposed to second hand smoke. Does cannabis create 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.