What's the point of misting if it's in the open? It only raises the relative humidity only slightly, and even then for a very very short amount of time. If you were going to mist with a spray bottle, you'd have to mist every few minutes to make a noticeable impact. And, if your plant is growing fine, the purpose of misting, no matter how little of an impact it will make, is unnecessary. The only time misting will help is if the plant is in an enclosed area, and the moisture will stay within the chamber, like a terrarium; otherwise, you are just raising the humidity of the entire world, at the tune of no negligible difference whatsoever, depending on where the water came from.
xvart.