a little bit of water sprayed in the tank isn't going to make a difference in humidity. if you have (good, digital) humidity guages, you can tell if it's causing any significant humidity spikes. and if your humidity is really low, say, below 20%, you might want to do extra baths or sprays to keep
hydration up. but if you have a screen-top cage, water sprayed in there evaporates quickly and goes right up out of the cage. i've got gecko cages that i have to spray to get humidity up, and i have to cover most of the screen top or else the humidity drops right back down within an hour.
don't overspray, don't spray at night (when evaporation is slower and the moisture will linger longer) and you'll be ok. no need to spray daily but if he likes
drinking droplets off his snout, that's fine. i use an eye-dropper to put it right on his snout, but that's more just to avoid wasting water.