The search for guilt-free indulgence has brought shoppers everything from 100-calorie packs to spray-on salad dressing. Now comes the next step — and this one may be hard to top: Breathable chocolate. Invented by a professor of biomedical engineering at Harvard, Le Whif, as it's called, is a lipstick-sized tube filled with chocolate powder that the user inhales in small puffs. The particles are too big to be aspirated into the lungs, but small enough to coat the taste buds with the sensory ...

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