Safer than smoking ciggs. Safest is don't vape lor. With each vice there will always be a side effect. Like sugar if eat too much you can get diabetes or even water if you drink until cannot drink but you still go and drink you will then drown on land cos water will enter your lungs and kill you.
You know what bros, I think we better stock up on sugar and water. Later kena ban cos it is bad for us. Hehehe.
Anyway don't worry too much about the vapor. A bit of water in the lungs is fine if you are healthy. The body will just rid itself of the excess moisture. Even the air we breath got moisture. The higher the humidity, the more 'water' is in the air. It is normal.