How do you smell?
Different smells trigger different receptor cells in the lining of the nose. You can detect thousands of different smelly substances or odorants. Most smells are a mixture of several odorants. Our ability to detect all these odorants varies – one in a thousand people cannot smell skunk odour. As well as the smells you are aware of, some scientists believe you can also detect human pheromones, 'attraction chemicals'.