Alcohol makes a recipe better, lungs don't deal well with liquids like water. Alch atomizes into vapor water don't.
Huh ? :O Ever heard of a thing called "water vapor", aka "steam" ?
Water takes more heat than ethanol to evaporate, but given the temperatures inside a vape at even the lowest wattages it will evaporate. The issue is rather about the corrosion it would entail on the coil -although, most coils being made of Kanthal ally, they'd be quite resistant to corrosion, at least during their useable lifespan).
I frequently have a little water left in my mix from having rinsed the tank (or even just from having the container open : VG is hygroscopic, i.e. picks up water from the ambient air), and it's no trouble at all, either on the vape or on the lungs. (You breathe more water vapor every day if only from the exhausts of the vehicles around you than you could have in your juice, unless you fill your tank at the kitchen tap... ^^)