In order to Exhibit the smoke pattern, a cat have to have the dominant allele of the first gene for coat color (B), and need to also have two copies in the recessive allele for that dense pigment gene (d/d) and a duplicate in the dominant melanin inhibitor gene (I). https://what-does-thca-do90011.onesmablog.com/recognition-breed-standards-things-to-know-before-you-buy-74529739