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In fact, a 2019 study in Scientific Reports showed that the smell of a park reduced stress better than its sounds or scenery. But there’s nothing special about, say, vanilla that makes it universally pleasing. We’ve just been conditioned to find it so “through a mechanism of learned associations, not a pharmacological effect,” Herz says. The reaction can be traced to infancy: Vanilla shares odorant molecules with breast milk and formula, an undoubtedly nurturing association. Fragrance houses have studied the emotional connection to scent for years, using intel from physiological research (one study found that lavender measurably reduced blood pressure in patients just out of open-heart surgery) and consumer perception panels (participants in a 2014 study rated pumpkin pie spice and Chanel N°5 as the two most nostalgia- evoking scents). More recently, researchers have been able to map how scents actually impact the brain.
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