

I have a very powerful sense of smell. I can tell who slept in my bed if I know that person well. It happened to me once in a college dorm, where a roommate slept in my bed while I was home for the weekend.
I can smell tobacco from far away too. Before anyone notices it.
I know if the cake in the oven is ready, by the smell it sends inti the living room, which has a dining room and a hallway in between.
Unfortunately, I can also smell bad smells very powerfully.
I think so, when I am ill. My sweat might smell different, or my breath. But I am not that superhuman. But there are some bad people smell that kind of repeat themselves. But I did not investigate these things. I know animals can detect some illnesses, maybe through smell.
The sense of smell also affects the taste. I can taste a lot of ingredients in an unknown dish. I also cook very well, maybe because of that. When I got Covid and the sense of smell went for a while, food tasted like nothing. It was kind of horrible to have to eat. I would focus on textures and spiciness.