There is actually a flower that smells like chocolate. Cosmos atrosanguineus, aka chocolate cosmos, is a plant from Mexico that can grow up to about 24 inches high and has a maroon-colored flower. It's famous for it's chocolate-y scent, but don't be fooled. No part of this plant is edible.
Source : http://www.omg-facts.com/Science/There-is-actually-a-flower-that-smells-l/38501