I am sure that the oil gets breathed, but I decided to get brave and use them, and I'm glad every time I step in the front door. What oil gets inhaled that contacts the nasal passages and upper lung passages will be gathered and swallowed, thanks to the cilia in the airways. I see no sign after six months of oil accumulating on any surfaces. My dry wood furniture could probably use some. Others might find it irritating, of course, but I will keep using the fragrance oil diffuser.
Add your voice to the conversation. Click here to answer this question.