Abstract: A filter for tobacco smoke comprises a porous substrate which has a deposit thereon of particles which are crystalline, positively charged at the pH of tobacco smoke, water-insoluble, hydrophobic, and oleophilic to provide a coalescing agent which acts to attract and neutralize the negatively charged particles which are dispersed in tobacco smoke. To increase the effectiveness of the filter, the tobacco has mixed therewith and deposited thereon particles of a water-insoluble, hydrophobic, moisture-laden, negative charge-imparting substance. Cigarettes made with tobacco thus treated furnish a number of advantages without being associated with the filter of the invention.

Abstract: A filter for tobacco smoke employs synthetic, inorganic, water-insoluble, anhydrous fibers having a positive zeta potential at the pH of tobacco smoke.To increase the effectiveness of the filter, the tobacco associated with the filter has mixed therewith and deposited thereon particles of a water-insoluble, hydrophobic, moisture-laden, negative charge-imparting substance.

Abstract: A filter for tobacco smoke comprises a porous substrate (other than tobacco) having a deposit thereon of particles of a water-insoluble hydrophobic moisture-laden substance, the major ingredient of the substance being water, which is activated by the smoke of burning tobacco to release the moisture. The filter may be in the form of a cartridge for insertion in a cigarette or cigar holder or as a filter tip made integral with a body of divided tobacco.

Abstract: To increase the effectiveness of the filter, the tobacco has mixed therewith and deposited thereon particles of a water-insoluble, hydrophobic, moisture-laden, negative charge-imparting substance. Cigarettes made with tobacco thus treated furnish a number of advantages without being associated with the filter of the invention.

Abstract: A filter for tobacco smoke comprises a porous substrate (other than tobacco) having a deposit thereon of particles of a water-insoluble hydrophobic moisture-laden substance which is activated by the smoke of burning tobacco to release the moisture. The filter may be in the form of a cartridge for insertion in a cigarette or cigar holder or as a filter tip made integral with a body of divided tobacco.

Abstract: A filter for tobacco smoke employs synthetic, inorganic, water-insoluble, anhydrous fibers having a positive zeta potential at the pH of tobacco smoke.To increase the effectiveness of the filter, the tobacco associated with the filter has mixed therewith and deposited thereon particles of a water-insoluble, hydrophobic, moisture-laden, negative charge-imparting substance.

Abstract: A filter for tobacco smoke comprises a porous substrate which has a deposit thereon of particles of a positively charged, water-insoluble, hydrophobic, oleophilic coalescing agent which acts to attract and neutralize the negatively charged particles which are dispersed in tobacco smoke.To increase the effectiveness of the filter, the tobacco has mixed therewith and deposited thereon particles of a water-insoluble, hydrophobic, moisture-laden, negative charge-imparting substance. Cigarettes made with tobacco thus treated furnish a number of advantages without being associated with the filter of the invention.