Johns Hopkins researchers find thousands of unknown chemicals in electronic cigarettes Hub High concentrations of flavor chemicals are present in electronic cigarette refill fluids Scientific Reports 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. The hidden dangers of vapes: VCU study reveals chemicals, risks and teen use VCU News Virginia Commonwealth University Vaping lung illness: Harmful chemicals found in e cig flavoring juice E Cigarette Brands Are Skirting the Rules About Health Warning Labels on Instagram, Study Finds The Brink Boston University