Light smoking' before pregnancy can cause major health problems Asthma and Allergy Foundation Tobacco can be bad for your health even if you are not the one smoking. Breathing in the smoke can lead to many health problems. Vaping is Second hand vape smoke linked to more asthma symptoms in kids Frontiers Publishing Partnerships Prenatal nicotine exposure during pregnancy results in adverse neurodevelopmental alterations and neurobehavioral deficits Can you vape while pregnant?