One of the reasons is my nose is much longer than yours. The inside of your nose has an area of about one inch. My nose has an area of almost 36 inches, or one yard. So there’s room for 220 million receptor cells inside my nose. Your nose only has 5 million receptor cells. That’s why I can smell drugs wrapped in plastic, hidden inside coffee grounds.
I can be trained to use my nose to search for suspects, victims, drugs, or explosives. When I’m working, I sniff six times per second.