What's in vapes? Toxins, heavy metals, maybe radioactive polonium Disposable vapes ban 'could lead to relapse in people trying to quit smoking' Vaping The Guardian 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 Just How Harmful Is Vaping? More Evidence Is Emerging. The New York Times