Lung cancer risks persist with e cigarette use after quitting tobacco smoking How Switching to E Cigarettes After Smoking Cessation Affects Lung Cancer Risk E cigarettes are not a healthier alternative to cigarettes. They contain nicotine and many harmful ingredients that can cause cancer and heart disease. Since these products are relatively new, we don't know all DID YOU KNOW? While some may think vaping is a safer alternative, the reality is that e cigarette aerosol can include all or more of the harmful substances in cigarettes. Understanding the facts