E-cigarettes are officially known as electronic nicotine delivery systems (ENDS). They are more commonly called e-cigarettes, e-cigs, e-hookah, or vapes. You may have seen ads or stories on the internet that say e-cigarettes are a safe way to help smokers quit smoking. There isn’t enough scientific evidence to say if this is true or not. Here’s what doctors and researchers do know right now. 
E-cigs work by heating a liquid that has nicotine and other chemicals in it. Heating the liquid turns it into a vapor. That’s what the user inhales and exhales. Some research shows that this vapor includes chemicals that are known to be harmful. Scientists are studying the health effects of using e-cigarettes. New information is coming in, but they don't have the answers yet. 
 
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