Commonly known as the indigo milk cap, the indigo (or blue) Lactarius, or the blue milk mushroom, is a species of agaric fungus in the family Russulaceae.

You could smoke it if you wanted to, but it won't do anything for you. It is, however, edible, though not choice. It's said to have a peppery flavor. I've found these before, but I haven't eaten them. :)