Students and Vaping Why Teens Vape and JUUL Health Risks High concentrations of flavor chemicals are present in electronic cigarette refill fluids Scientific Reports What's hiding in that vape puff? Vapes might look clean or harmless on the outside, but inside the aerosol is a mix of chemicals and metals created when the liquid is heated. Vaping Harmless. Vape aerosol contains toxic chemicals like formaldehyde, arsenic, lead, chromium, and nickel. They damage lungs. They harm developing brains. They raise cancer risks. We