With each of the more than 23,000 breaths we take per day, air travels through the respiratory system into the lungs, where vital gas exchange occurs: oxygen is absorbed, and carbon dioxide is expelled. This involuntary and essential act also triggers another, less visible but deeply impactful process—our perception of smell. As air passes through the nasal cavity, odor molecules come into contact with olfactory receptors located in the olfactory epithelium. These receptors send signals directly to the olfactory bulb, which is part of the limbic system—the area of the brain linked to memory and emotion. Far from being a secondary sense, smell acts as a direct bridge between the environment and our deepest emotional responses. Scents carry a unique power to evoke vivid memories, elicit comfort or immediate aversion, and influence our emotional state almost instantaneously.
