Comment by theodric
I don't understand why you'd want anything in your house to release smells independently of delivering some essential function. I find it distracting at best, and headache-inducing at worst. Cosmetic products are particularly offensive. Let this study serve as a call to eliminate stinky products!
Generally the "pleasant" odor is meant to cover up some combination of "unpleasant" odors. It's nice when the area around a liter box doesn't smell like cat piss.