The vapor produced by e-cigarettes isn’t water vapor and it is not harmless. The vapor inhaled from vapes is often a mixture of harmful chemicals such as nicotine, formaldehyde, and acrolein (chemicals known to cause cancer or lung damage).
Even if they have fun flavors like fruit, mint or bubble gum, they carry the same risks as unflavored products. Also, some of the chemicals that make up the flavors can be harmful if inhaled into the lungs.