All E Cigarettes Emit Harmful Chemicals, but Some Emit More Than Others Berkeley Lab Berkeley Lab News Center What Are the Ingredients in Vape Juice? What's in Your Vape? A Look at the Chemicals You're Inhaling Chemwatch 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 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.