Nitrosamines are reduced in tobacco by treating a whole tobacco leaf with ferulic acid. The internal electrodes are partly exposed at surfaces of the laminate and are electrically connected to each other with the external electrodes. In particular, this has the effect of shortening the dead times when changing between the energy levels. Delayed dilution of a concentrated extract to provide a beverage brewing system which immediately provides selective dilution of a fresh brewed coffee extract after the extract has been allowed to brew and held as an extract before dilution. In another embodiment, the polyols are monosaccharides such as glycerols and sugar alcohols, and may include mannitol, sorbitol, glucose, fructose, galactose, mannose, lactose, maltose, allose, etc. The base body and the knitted fabric may be in contact, or, for improved adhesion between the base body and the knitted fabric, a fibrous assembly may be disposed between the base body and the knitted fabric.