Vaping is risk reduction.  Vegetable glycerin(palm derived) and propylene glycol(approved by FDA for inhalation), optional nicotine, and food grade flavorings are what make up the ingredients in most refillable vapes.  Those gas station vapes - stay away.  Many of them weren't even made in the US.  The nicotine levels in some of them are ridiculous.   I've seen them have more nicotine than cigs.  They're a good stepping stone.  When you eliminate the addiction from all of the hazardous chemicals in cigs, all you have to deal with is nicotine, which you can step down.  It works very well.