Which of the following is NOT a common type of BBQ smoker?

A rice cooker is not a common type of BBQ smoker because it is designed specifically for cooking rice through steaming, which is fundamentally different from the smoking process used in BBQ. BBQ smokers utilize indirect heat and smoke from burning wood or charcoal to cook food slowly, imparting a unique flavor to meats and other items.

On the other hand, offset smokers, pellet smokers, and electric smokers are all recognized types of BBQ smokers. Offset smokers have a separate firebox that allows for indirect cooking, enhancing the smoke flavor. Pellet smokers use compressed wood pellets to create heat and smoke, while electric smokers operate using electrical elements to generate heat and maintain consistent temperatures for smoking. Each of these three types is specifically designed for the smoking process, making them integral to various BBQ styles.