Vaping has often been promoted as the 'safer way to get nicotine into your body' but truth is, vaping hasn't been around long enough for long term studies to show the possible harm it does to the human body. As far as I'm concerned, anything but fresh air that we beath into our lungs has a potential to harm us. Even fresh air these days is getting harder and harder to find, depending on where one lives which adds more wehight to not introduce anything else to our lungs that may have a negative effect.
There's a section on this forum with threads about vaping. Perhaps you could read those as a source of infomation?
https://www.quittrain.com/forum/18-vaping-juuling-unquestionable-addiction-reckless-aftermath/