Vapes on black market may contain toxic chemicals, pesticides, harmful flavorings 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. What Are the Ingredients in Vape Juice? Vape bill eases restrictions on flavors, online advertising VERA Files Small device. BIG impact. Vapes are NOT harmless and many contain nicotine that can hook the brain in seconds, plus chemicals and metals that can damage the lungs. The earlier Chemicals in e cigarettes mix together to form new, unexpectedly toxic compounds EurekAlert!