The vapor produced by e-cigarettes is actually water.

The statement is false because the vapor produced by e-cigarettes is not simply water. While it may contain some water vapor, it also consists of various other substances such as propylene glycol, glycerin, flavorings, and potentially harmful chemicals like nicotine and formaldehyde. These additional components are heated and aerosolized by the e-cigarette devices, creating a vapor that users inhale. Therefore, it is incorrect to claim that the vapor produced by e-cigarettes is just water.