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5. Follow Your Nose

Notice how the mouthwatering smell of cookies greets you at the supermarket entrance? While supermarkets don't fabricate smells, according to Lempert, they do use smells to encourage more shopping. "The more the store can attract all our senses, the more we're going to buy," he says.

Whole Foods supermarkets, for example, have chocolate-making stations in many of their stores. And don't think that putting the rotisserie chicken near the entrance is an accident. "It's one of the first things you see when you walk into the store wondering what to make for dinner," Danger says. Don't forget samples, either: those very conveniently trigger your appetite.

What you can do: Never enter the supermarket hungry.

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