sounds a bit like my house, there is one of those horrible plug in air fresheners in just about every room, i'm continually switching them off....i hate the stuff.
I hate those! I was using that nasty glade spray stuff for awhile when I first moved into my apartment, because the last tenants were smokers and there was a nasty, "funky" smell through out the place. Thank god it's warm enough to just leave the windows open now.
One neat thing you could suggest instead, is pick up some of those scented pinecones. They are all over around Christmas, but you can usually find them at some craft stores. Put one in a couple of the air vents around your house, or just leave a couple in a basket or something in one or two rooms (depending on the size of your house). Leaves a nice smell, not over-powering perfume-y or flowery, and no nasty chemicals in the air.