and can be discarded or used for other applications such as a source of biofuel backfill fertilizer etc the supernatant liquor from the extraction process may typically contain 1 to 7 percent dissolved solids depending upon the type of tobacco the tobacco water ratio the extraction conditions e g static or stirred water temperature and digestion time of tobacco in water the extraction liquor may be concentrated by digesting more tobacco into the liquor or may be subjected to evaporative or other drying processes to remove excess water suitable drying techniques include evaporation by static or circulating air techniques at ambient or elevated temperatures spray drying freeze drying vortex drying critical point drying and the like if excess water is removed by evaporation low heat should be used to avoid thermal decomposition of organic components within the extract liquor the resultant dried tobacco extract powder may then be added to cement and concrete mixes of the types and in the amounts described above the dried tobacco extract powder typically has an average particle size of from about 0 01 micron to about 5 mm the following example is intended to illustrate various aspects of the present invention and is not intended to limit the scope of the invention dried chopped leaves of tobacco are added to conventional portland cement powder in amounts of 0 1 0 5 and 1 weight percent of the dry weight of the cement the dry mixture of cement powder and comminuted tobacco is mixed with c33.