New study comes the closest yet to proving that e cigarettes aren't as dangerous as smoking E cigarettes contain hazardous substances, addictive and harmful Vapes might be less harmful than traditional cigarettes and might help smokers quit smoking, but they are not safe, especially for individuals younger than 25 years old. Plus, much is still unknown Is vaping more harmful than smoking cigarettes? More people incorrectly think so: Newsroom UT Southwestern, Dallas, Texas