The invention relates to a method for adjusting the selecting out of winnowings in the manufacture of smokable products, in particular cigarettes, wherein the current size distribution of a stream of tobacco particles passing a measuring point, per unit of time, is detected and compared with a settable nominal size distribution, and wherein an arrangement for separating the winnowings is continually adjusted, depending on the result of said comparison, and to a corresponding device comprising a sensor for detecting the current size distribution, an arrangement for inputting a nominal size distribution, an arrangement for comparing said current size distribution with said settable nominal size distribution, and lastly an adjusting arrangement for setting the arrangement for separating the winnowings, depending on the output signal of said comparing arrangement.