Ever wander into an Abercrombie and Fitch and think, "Am I catching a whiff of white bergamot?" Of course you don't. You're not a nerd! You're just looking for a pair of cheap jeans before hitting the food court for a fro-yo. But scent marketing is a real thing, and like Proust's madeleines — the scent of those jeans will linger in your memory long after you've bought them. Jennifer Dorozio explains.