Vaping releases toxic chemicals, including heavy metals, as well as ultrafine particles that go deep into the lungs. These increase the risk of heart and lung disorders. E Cigarette Brands Are Skirting the Rules About Health Warning Labels on Instagram, Study Finds The Brink Boston University Vaping Chemicals Mix to Form New Toxic Compounds Respiratory Therapy Avoiding Tobacco Smoke and E Cigarette Aerosol Is a Key Part of Asthma Management Asthma and Allergy Foundation of America