A good thing to note is that vaping is not the same thing as smoking.
E-liquids utilize four main ingredients: propylene glycol, vegetable glycerin, nicotine, and artificial/natural flavorings. This mixture gets vaporized by a small battery powered atomizer.
While vaping isn’t proven to be 100% safe, there are many studies that are currently looking into the effects of vaping and e-liquids (feel free to take a look at notblowingsmoke for a list of studies and their results.) Many people do state that they feel a difference after switching from tobacco to vapor products, even after just a couple of months.