Old books have a distinct smell that many people find comforting and nostalgic. For some, the aroma is so pleasant that it instantly takes them to childhood libraries or cozy reading corners. But what exactly causes this scent, and why do only certain people enjoy it? Experts say the answer lies in chemistry, memory, and individual sensory perception.
The Chemistry Behind the Smell
The pleasant smell of old books comes from the natural breakdown of materials used in bookmaking. Books printed decades ago were typically made with paper containing cellulose and lignin—two organic substances that slowly decompose over time. As these materials age, they release a range of compounds into the air.
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Among these compounds are benzaldehyde, which has an almond-like aroma; vanillin, the same compound that gives vanilla its scent; ethyl hexanol, which smells slightly floral; and toluene, which carries a sweet, pungent note. Together, they create the characteristic “old book smell.”
Scientists say that these compounds are released faster in humid or warm conditions, which is why old books stored in closed spaces often smell stronger. This scent is completely natural and not harmful in normal amounts.
Why Some People Love It?
While many enjoy the fragrance of old books, not everyone feels the same way. Doctors and psychologists explain that preference for certain smells is shaped by personal experience and brain chemistry.
For some readers, the smell is tied to pleasant memories — childhood visits to libraries, long study sessions during school days, or hours spent reading at home. These memories build a positive emotional connection. When the brain detects the familiar scent again, it triggers a sense of comfort and nostalgia.
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Experts say the smell acts as a “memory trigger,” releasing emotions stored in specific experiences. This phenomenon is known as the Proust Effect, where scents bring back vivid memories more strongly than visual or auditory cues.
The Role of Individual Sensitivity
Another reason some people love the smell while others don’t lies in differences in sensory perception. Every individual has a unique sense of smell. Some noses are more sensitive to the sweet, warm compounds in old books, while others detect sharper or mustier tones and find them unpleasant.
Age also plays a role. Scientists note that younger people tend to respond more positively to natural, earthy scents, while some older adults may have reduced sensitivity to subtle aromas, affecting how they perceive old books.
Why the Aroma Evokes Calmness?
According to reports, for many, the smell of old books has a soothing effect. Psychologists suggest that physical books — especially older ones represent slowness, focus, and escape from screens. Their scent is often linked to quiet environments like libraries and study rooms. This association creates a calming emotional response, especially in people who enjoy reading.
Some researchers even compare the old book smell to scents used in aromatherapy because of the comfort and familiarity it brings.
