OK i got a HUMIDIFYER BUT IT REQUIRES SALT FOR IT TO WORK? SO salt will be in the air in my room. it makes smoke the humidifyer thats what its suppose to do right. do i run it for a while? its going to eventually run out of water. im going to get a humidifyer Measuring tool tomarow or some thing. how long do irun it for as long as i can.. keep refeeling water. run it before school? or should i not run it because of salt?