All E Cigarettes Emit Harmful Chemicals, but Some Emit More Than Others Berkeley Lab Berkeley Lab News Center How do vapes work and what chemicals are inside them? BTN High Vaping, Environmental Toxicants Exposure, and Lung Cancer Risk Vaping isn't just vapor. It's an aerosol filled with nicotine and chemicals that go deep into your lungs and straight into your bloodstream. Many vapes contain: Highly addictive nicotine High Levels of Fruit flavored Chemicals in E cigarette Liquids