Vaping: What Students Should Know Fairfax County Public Schools High concentrations of flavor chemicals are present in electronic cigarette refill fluids Scientific Reports Avoiding Tobacco Smoke and E Cigarette Aerosol Is a Key Part of Asthma Management Asthma and Allergy Foundation of America 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.