It COULD cause some respiratory problems, and if the substrate is wet scale rot could occur...
MH
Who the hell is Pat?
"Pattimuss doesn't run, he prances most delicately, like a beautiful but sad fairy, winged and capped, curly toed shoes on each foot, dancing on dewdrops while lazy crickets play soft music for him to keep time by...." - Wes
I'm guessing this is a new set-up and your substrate is retaining some moisture. If it doesn't come down in a day or two post a picture (or describe) of your set-up and I'm sure someone will help you.
Based on my experience, which may or may not apply to the conditions in your house, as long as the substrate is not wet and/or condensation is collecting on the sides of the enclosure, you'll be fine. The humidity won't stay up that high for long periods, and for short periods it won't hurt the snake.