Whether you’re a bookworm or not, you are undoubtedly familiar with the smell of old books. If nothing comes to your mind, just imagine entering a library or a store selling used books, and you will immediately remember this sweet scent of vanilla with barely discernible bitterness of freshly grounded coffee. Some people might find this smell nauseating, but even a more significant number of readers are literally addicted to it. Ever wondered why do old books smell? Here is a scientific answer to this mystery of “smelling books” addiction!