Review (4/5): Such a great device! Husband needed this for a chest cold and it's been very helpful.
So far so good. I cleaned the plastic water holder with soap/water before using since it had a strong plastic-chemical smell. Then I rinsed the opening where the water container attaches -- and then ran it for 2 minutes without breathing the vapors. After the 2 minutes it smelled fine.
My husband had been using a pot of water on the stove to breath steam for his stubborn chest cold -- and it was too awkward. This device makes it super easy for him to do treatments in under 1 minute.