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Actually, it is smell. Research shows that there is a powerful link between smell, memory and emotional state. When scientist Hendrick Schifferstein from Delft University of Technology pumped the smell of orange, peppermint or seawater into a nightclub the revelers partied harder - they danced more, rated the night as more enjoyable, and even thought the music was better - than when no scent was added (Chemosensory Perception, vol 4, p 55).
The surprising thing about the research done on smells is that most of the subjects aren't even aware of the smell, yet it still affects their behavior and emotions.
Major industries know the power of smell.