Cadmium is a metallic chemical element (atomic number 48). Once widely used in pigments and rechargeable batteries, it is slowly falling out of use due to better technologies and it's underlying toxicity - it is a common source of heavy metal poisoning, both from its industrial uses and in the environment.
In Sports Medicine, Hank Wiggen and Lola Wiggen contract cadmium poisoning from smoking marijuana grown in cadmium-laced soil.