The reason cats like to smell humans is because they use their sense of smell to understand their surroundings. Cats have a very keen sense of smell, about 15 times stronger than that of humans. They use their sense of smell to judge the smells around them, which is an important survival mechanism for them. Cats like to smell human scent because it is very familiar to them. If a cat spends a lot of time around humans, they may consider human scent a household scent and enjoy smelling it.
Also, cats may like to smell humans because they like that person. Cats often use their sense of smell to identify their owners, and they also use their sense of smell to express affection when they feel relaxed and safe. Generally speaking, cats like to smell humans because they use their sense of smell to understand their surroundings and express their affection for humans.