It's a blessing and a curse -- this ability some of us have to smell the slightest aroma, the knowledge that we could at any time be recruited by the F.B.I. to work as an airport sniffer. Not much that can be done in public to make aromas a little less pungent, but at home you can have one of these Purifans ($390). It's a cool ceiling light, surrounded by a filtration system that pulls the odors and impurities from the air. Even if you don't have the olfactory skills of a beagle, the Purifan is great for those who suffer from allergies or live with a smoker.