Extensive experimentation conducted over the course of many years has led me to believe that cats' foreheads smell pleasant to humans. I invite you to attempt to replicate my findings, by following these easy steps:
Take a reasonably clean cat which likes you enough not to maul your face if you try to smell its head. Put your nose on its forehead, where the top whiskers are. Inhale deeply. Doesn't that smell nice?
(If it doesn't, you may actually be smelling your cat's awful catfood breath. Move your nose further away from the cat's mouth, and try again.)
It's a well-documented fact that cats secrete happy-cat pheromones from glands on their faces, and that these pheromones are found pleasant and reassuring by other cats. I am very disappointed that nobody has devoted serious research to the effects of this chemical on humans.
Now I know what drives well-adjusted people from good homes to kitten huffing.