Filter segment including a substrate loaded with a smoke-modifying agent

A filter segment for use in a filter of a smoking article, the filter segment comprising:

• a substrate loaded with menthol solution, the substrate located within a body of the filter segment and formed from a filter plug wrap having an air permeability ranging from about 7,500 Coresta units to about 20,000 Coresta units and a grammage ranging from about 25 g/m2 to about 80 g/m2, and the filter plug wrap capable of absorbing more than 100 percent of its weight of menthol solution, and the substrate including a ball of the filter plug wrap, a pellet of the filter plug wrap, or both a ball of the filter plug wrap and a pellet of the filter plug wrap.