New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking Johns Hopkins researchers find thousands of unknown chemicals in electronic cigarettes Hub Is Vaping Harmful? Side Effects, Health Risks, & Care Health Effects of Vaping Smoking and Tobacco Use CDC 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