How does the disposable vape ban work, and how harmful is vaping? What's Actually in Your Vape: A Complete Chemical Breakdown Researchers Find Toxic Metals in E Cigarette's Johns Hopkins Bloomberg School of Public Health 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