Which beer style is characterized by the use of smoked malts?

Rauchbier is a beer style specifically known for its use of smoked malts, which impart a distinct smokiness to the beer. The term "Rauch" translates to "smoke" in German, which is indicative of this style's primary characteristic. The malts are usually dried over an open flame or smoked, creating flavors reminiscent of wood smoke, which can range from subtle to quite pronounced. This unique feature gives Rauchbier its signature profile, appealing to those who enjoy the complexities that smokiness can add to a beer.

In contrast, the other styles mentioned do not typically emphasize smokiness in their flavor profiles. Porters may have roasted malt flavors, but they are not specifically known for using smoked malts. Witbier is a Belgian style of wheat beer often brewed with spices and citrus, while Belgian Dubbel is known for its rich malt flavors and fruity esters, but neither is associated with smoke in the way Rauchbier is.