Do you buy cinnamon in the store? Beware of his dangerous doppelganger, Cassia

Cassia is banned in many European countries, and in some countries it is only used to make rat poison.
 
Cassia contains coumarin, a chemical used to make rat poison, according to the German Federal Institute for Risk Assessment. The FSSAI says that a low dose of coumarin consumed over several months can cause liver damage.

How to tell Cassia from Cinnamon?

Cassia cinnamon sticks are one thick, hard layer of bark rolled into a tube, while Ceylon sticks are several thin, soft layers of bark rolled together. Ceylon cinnamon also tends to be lighter than cassia.