One of the primary uses for color vision is to tell the freshness of food. That's actually true of smell and taste as well. Amazing how much evolution has had to spend on "can I eat this?".
My sense of smell is very limited. I'd argue similar to mostly blind peoples vision. Very strong smells I can pick up, but it has to rise to a certain level before I can detect it. I think it is one of the reasons I like spicy food, it really cuts through.