One day in Capri, the smell of the Tyrrhenian Sea filled the air and Champagne bubbles tickled my nose as I got engaged. I remember what I was wearing, olfactorily speaking: Dior Lucky, a joyful lily of the valley. This bottle of happiness still transports me back to that day—and there are five good reasons why.
1. There’s a biological pathway between scent and emotion.
With each breath we take, we inhale more than air. Above the nasal cavity is the olfactory bulb and, when stimulated by scent molecules, its neurons send messages directly to the brain’s limbic system, which controls behavioral and emotional responses. So, as we perceive smell, we get an emotional bang at the same time, says Rachel Herz, PhD, a neuroscientist and adjunct assistant professor of psychiatry and human behavior at Brown University.
If you lose your sense of smell, a condition known as anosmia, you may experience a significant void in how you process emotions, and memories can even be incomplete. “[Odor] affects countless subconscious interactions we have throughout our lives,” says Zara Patel, MD, an associate professor of otolaryngology at the Stanford University School of Medicine. “It is a primary determining factor in how we choose sexual partners and life mates, and it allows us to pick up on and respond to many social cues.”
2. It’s all a bit of a mind game.
“Smells exist only in our heads. Molecules exist in the air, but we can only register some of them as ‘smells,'” writes psychologist Avery Gilbert, PhD, in What the Nose Knows: The Science of Scent in Everyday Life. How you think something smells — good, bad, funky, clean — depends on your experiences. When two people sniff a perfect May rose, they can have totally different reactions based, in part, on their memories associated with that scent.
In perfumes, “the fact that a molecule of phenylethyl alcohol smells like rose is a function of our brain, not a property of the molecule,” writes Dr. Gilbert. “Odors are perceptions.”
3. Where you live matters.
“The associations we have with fragrances are learned through personal experience with the scent and our cultural [experience], like how lavender is relaxing [to many],” says Dr. Herz. If you were French Canadian, however, you would likely find maple or wintergreen more familiar than lavender, as illustrated in a study published in the journal Chemical Senses.
Vanilla is generally comforting, like a big slice of birthday cake (its scent is also similar to breast milk), while musk is perceived as clean. “Musk has been used in laundry detergents, so people associate musky notes with freshness and nostalgia,” says Mackenzie Reilly, a perfumer at International Flavors & Fragrances.
4. You might stop noticing a loved one’s perfume.
When you’re continuously exposed to a scent, “your brain says ‘been there, done that’ and doesn’t pay attention anymore,” explains Calice Becker, a perfumer and director of the Givaudan Perfumery School in Paris. The technical term for this is olfactory adaptation. “After about 20 minutes, we no longer smell [a scent],” says Dr. Herz.
5. Seeing isn’t the only way of believing.
As David Moltz, the perfumer behind D.S. & Durga, says, “You can say the same amount with fragrance as any other art form. You can create a whole narrative with aromas.”
Fragrance preferences are shaped largely by learned associations — scents encountered repeatedly within a specific cultural or geographic context become familiar and pleasurable. Research published in the journal Chemical Senses illustrates this: people raised in French Canadian environments tend to find maple or wintergreen more comforting than lavender, which is the dominant relaxation scent in Western European contexts.
The olfactory bulb sits above the nasal cavity and, when stimulated by scent molecules, sends signals directly to the brain’s limbic system — the region governing emotional and behavioral responses. This direct neural pathway is why smells can trigger immediate emotional reactions and vivid memory recall in a way that other senses typically do not.
Olfactory adaptation is the brain’s mechanism for filtering out continuous or repeated stimuli as non-essential. After approximately 20 minutes of sustained exposure to a scent, the brain effectively stops registering it. This is why people frequently become unable to detect their own perfume or the fragrance of someone they live with — the nervous system deprioritizes predictable sensory input.
Scent perception is subjective and experiential rather than objective. As fragrance psychologist Avery Gilbert notes, odors are perceptions — the same molecule can smell entirely different to two people depending on the memories and emotional associations each has built around that scent. There is no universal standard for what smells pleasant or unpleasant; cultural background, personal history, and neurological factors all play a role.
Yes. Anosmia — the loss of the sense of smell — can create a significant void in emotional processing and memory formation. Stanford otolaryngologist Zara Patel notes that scent is a primary factor in how people choose partners, respond to social cues, and navigate subconscious interpersonal interactions, meaning its absence can have wide-ranging psychological and relational consequences.
