Why do people have different sensitivity to smells?

People have different sensitivities to smells due to a combination of genetic, physiological, and environmental factors. Genetic variations can affect the structure and function of olfactory receptors, influencing how individuals perceive and respond to different scents. Additionally, age, health conditions, and exposure to certain odors can shape one's olfactory sensitivity over time. Cultural background and personal experiences also play a role in how smells are interpreted and valued.