Many consumers wonder about the safety of e-cigarettes and whether they are a healthier alternative to traditional cigarettes. RELX e-cigarettes contain ingredients such as glycerin, propylene glycol, nicotine, and flavors. While glycerin and propylene glycol are commonly used in food products, and flavors are also found in food, it's important to note that nicotine is present in electronic cigarettes, which still poses health hazards. If you don't smoke, it is still not recommended to start using e-cigarettes.