Clean Air Zone No Smoking No Vaping Portrait Wall Sign If you vape, you inhale a lot of harmful substances. These can damage your heart and lungs. Vaping Produces Far Less Second Hand Nicotine Than Smoking Respiratory Therapy Vaping Impairs Vascular Function, Even Without Nicotine, Study Finds What Does Vaping Do to Your Lungs? Johns Hopkins Medicine MTL vs. DTL inhaling demonstration