Vaping is a pretty effective way to stop smoking. I smoked for decades, after one week vaping I quit smoking.
Vaping is mainly a physical process that changes fluids to gases. It is very generally assumed that it is a lot safer than smoking. Apart from one exception my e-liquids are officially approved for human consumption. The one exception of course is nicotine, but that is pretty easily metabolized. So while you definitely should not consume to much of it, it either kills you very fast or it won't kill you at all.