How Do You Trademark a Smell?

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Play-Doh has an distinctive scent that is recognized by the United States Patent and Trademark Office. It is a registered trademark of the brand. But how do you trademark a smell? First, you must describe it and send it off to the office. Then it gets an official government smell test. Hasbro describes it as a "unique scent formed through the combination of a sweet, slightly musky, vanilla-like fragrance, with slight overtones of cherry, and the natural smell of a salted, wheat-based dough. Is this what you recall as the Play-Doh scent? I remember the saltiness and the cherry. The picture is from clipart-library.com