Scientists explain why that 'one smell' evokes the most blissful memory
"A single smell may instantaneously evoke a past event in our life."

A woman sniffs a flower which evokes memories.
Ever wonder why you might get a trace of a scent and instantly get carried back to a year, a time, a place? (For me, it's Scotch tape. On the rare occasion that I smell it, I'm transported right back to Christmas in the early '80s.)
The brain's olfactory bulb, which processes the sense of smell, has the strongest influence on conjuring up memories. A recent article in Harvard Medicine cites Professor of Neurobiology at Harvard Medical School, Sandeep Robert Datta, saying, “It’s now clear that even though our sense of smell is not as robust as that of a mouse or bloodhound, it is deeply tied to our cognitive centers, our emotional centers, and our memory centers. We’re dependent on it for a sense of well-being and centeredness in the world.”
Once a scent molecule enters the nasal cavity and reaches one of the "smell sensors," it makes a pit stop in the olfactory bulb and gives "information" to the cerebral cortex. In an educational video posted by Britannica, they relay "Since some of these regions are also involved in memory, a single smell may instantaneously evoke a past event in our life."
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McDonough explains further that the information or "signals" then travel "to key areas of the brain involved in learning, emotion, and memory: the olfactory, or piriform cortex, which identifies smells; the amygdala, which is involved in generating emotion; and the hippocampus, which stores and organizes memories."
If our brain has subconsciously made a connection between a smell and something that impacted our memory, it can "store it indefinitely." She shares, "Even decades later, the same scent can bring the memory and emotional salience of the moment flooding back."
Redditors—of which there are nearly eight hundred on this thread alone—jumped to comment on the post, "What's a smell that instantly takes you back to your younger years?" The first comment is very specific: "Hot asphalt. It's immediately summer in the late '70s and I'm either playing 4-Square in the road, or we're at Six Flags."
A roller coaster loops around at Six Flags amusement park.
Photo by Zachariah Aussi on Unsplash
This got hundreds of upvotes, with one person adding that they especially love the smell of asphalt in the rain. Someone then took the time to respond with the beautiful science behind that exact scent: "That smell is called petrichor and is caused by a terpene called geosmin that is released from the earth after being hit by rain. It’s a Greek word. ‘Petri’ means stone and ‘ichor’ is the golden liquid that flowed through the blood of Gods. So not only is it an amazing smell, it’s also one of the coolest words with a most unique etymology."
Quite a few also mentioned suntan oil. One person even deviously found a way to manipulate their boss, knowing how strongly it evokes memories in so many of us: "When I used to work in an office, I’d put on Coppertone at my desk Friday afternoons when I really wanted to get out early and enjoy nice weather. My boss would smell it and leave around 2 to play golf. (edit: Hawaiian Tropic)"
Along the same lines and also quite popular in the comment section was chlorine. "Chlorine in swimming pools! Not used so often anymore where I live, but back in my grandma's hometown, it's the same as ever!" Another adds how specifically this smell taps into a memory: "Being wrapped in a towel, eating ham and cheese sandwiches with Doritos by the pool was peak childhood."
A young girl swims in a pool.
Photo by Mariano Nocetti on Unsplash
So many more chimed in with answers—from freshly cut grass pulling them back through a memory tunnel to an elementary school playground, to the smell of leather reminding them of their Little League baseball team. The glue (which itself seems to trigger past experiences) that binds most of the comments seems to be: sweet memories from childhood.
A few more shared comments for the road:
"Concord grape juice gets me every time."
"A fog machine. Takes me back to the days I worked at Knott's Scary Farm."
And maybe my personal favorite? "Drakkar Noir, baby."