Secondhand Vape Exposure: Effects, Who's at Risk, and More What science says about vaping risks The Examination Vapes are often sold in sweet flavors and colorful packaging that appeal to teens., But heres the truth:, They contain addictive nicotine that can harm the developing brain., Some products may About Secondhand Smoke Smoking and Tobacco Use CDC Many people believe that vaping is less harmful than smoking, but that's a common misconception. In fact, in addition to nicotine, vapes can contain toxic chemicals that could be linked to cancer,