I love the Bath & Body air fresheners, but yes, I've noticed that I stop smelling them after a while too. But I do love to use them, and I think they're a lot safer than candles. I'm thinking maybe I'll just buy a few different scents, and alternate which ones I have plugged in.
PS: I have to laugh about people who are freaked out about all the chemicals... umm... all products everywhere have scents in them. Shampoo, bar soap, laundry soap, dish soap, and that's not considering that most of us wear deodorant, perfume, hair spray/gel and the like on a daily basis. Not to mention the not-so-pleasant smells of living in a large city: car and bus exhaust, garbage bins, industrial waste, homeless people peeing on the sidewalks. So you have heated oil with a scent in it, plugged into an outlet in the living room. What's the big deal there?