Depends on how the humidity is being achieved. Natural humidity outside or the relative humidity that is inside your house normal then no. If the enclousure is staying drenched through misting sessions or a humidifier that is running all the time then possibly. This is just in relation to the dangers that come with standing water of any type. Some groups of veileds are native on the southwestern side of mountains in Yemen that recieves 80" of rain a year. This climate is similar to that of a jackson or other montane species. This is an extreme humidity type climate so I would not worry about it with veileds. Just make sure it is safe humidity.