You searched for: “fumigation
fumigation (s) (noun), fumigations (pl)
1. The act of fumigating or the application of a gas or smoke to something for the purpose of disinfecting it; the use of a fumigant.
2. Etymology: "to make aromatic smoke as part of a ceremony" from Old French fumigation, from Latin fumigationem, fumigatio, from fumigare, "to smoke"; from fumus, "smoke, fume" + root of agere, "to drive".

The sense of "to expose (someone or something) to aromatic fumes" is originally a reference to a medicinal or therapeutic treatment.