There is a vine growing over my sister's porch which has pods unlike any I have seen before.
The pods (they are not present yet - the plant is still blooming) are large and fat, perhaps several inches long and over an inch wide. They are a blueish-green color, if I remember right.
I am attaching pictures of the flowers (which are in bloom right now) and leaves.
The plant is growing in Bellingham, Washington.
I don't recognize a chocolatey smell, but then again I don't know what a cacao plant smells like.
This definitely seems to be what the plant is, though.
These pods look just like what I remember from last season. They were still fairly green when I visited, but I'll watch for the purple color next time.