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A low sidestream smoke cigarette comprises a conventional tobacco rod and a non-combustible treatment material for the rod. The treatment material has a porosity less than about 200 Coresta units and a sidestream smoke treatment composition. The treatment composition comprises, in combination, an ox

A low sidestream smoke cigarette comprises a conventional tobacco rod and a non-combustible treatment material for the rod. The treatment material has a porosity less than about 200 Coresta units and a sidestream smoke treatment composition. The treatment composition comprises, in combination, an oxygen storage and donor metal oxide oxidation catalyst and an essentially non-combustible finely divided porous particulate adjunct for said catalyst. In addition, the invention provides a low sidestream smoke cigarette unit that comprises a cigarette with conventional cigarette paper surrounding a conventional tobacco rod and a non-combustible treatment material surrounding and being substantially in contact with the conventional cigarette paper. The non-combustible treatment material comprises a sidestream smoke treatment composition, wherein the non-combustible treatment material has a porosity less than about 200 Coresta units and the treatment composition comprises, in combination, an oxygen storage and donor metal oxide oxidation catalyst and an essentially non-combustible finely divided porous particulate adjunct for said catalyst.

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1. A low sidestream smoke cigarette comprising a conventional tobacco rod and a non-combustible treatment material for said rod, wherein said treatment material has a porosity less than about 200 Coresta units and a sidestream smoke treatment composition comprising, in combination, an oxygen storage

1. A low sidestream smoke cigarette comprising a conventional tobacco rod and a non-combustible treatment material for said rod, wherein said treatment material has a porosity less than about 200 Coresta units and a sidestream smoke treatment composition comprising, in combination, an oxygen storage and donor metal oxide oxidation catalyst and an essentially non-combustible finely divided porous particulate adjunct for said catalyst. 2. A cigarette of claim 1, wherein said non-combustible treatment material has a porosity of from about 0.5 to about 30 Coresta units. 3. A cigarette of claim 1, wherein said adjunct has an average particle size of less than about 30 μm. 4. A cigarette of claim 3, wherein said adjunct is a high surface area material with a surface area in excess of about 20 m 2 /g and an average particle size greater than about 1 μm. 5. A cigarette of claim 4, wherein said adjunct is selected from the group consisting of clays, essentially non-combustible milled fibres, monolithic mineral based materials, essentially non-combustible activated carbon, zeolites and mixtures thereof. 6. A cigarette of claim 5, wherein said non-combustible milled fibres are selected from the group consisting of zirconium fibres, zirconium/cerium fibres, ceramic fibres, carbon fibres and mixtures thereof. 7. A cigarette of claim 5, wherein said monolithic mineral based materials are selected from the group consisting of zirconium oxides, titanium oxides, cerium oxides and mixtures thereof. 8. A cigarette of claim 5, wherein said zeolites are represented by the formula m M′ n M″ P [a AlO 2 .b SiO 2 .c TO 2 ]whereinM is a monovalent cation,M′ is a divalent cation,M″ is a trivalent cation,a, b, c, n, m, and p are numbers which reflect the stoichiometric proportions,c, m, n or p can also be zero,Al and Si are tetrahedrally coordinated Al and Si atoms, andT is a tetrahedrally coordinated metal atom being able to replace Al or Si,wherein the ratio of b/a of the zeolite or the zeolite-like material, has a value of about 5 to about 300, and the micropore size of the zeolite is within the range of about 0.5 to 1.3 nm (5 to 13 Å). 9. A cigarette of claim 5, wherein said zeolite is selected from the group consisting of silicalite zeolites, faujasites, X, Y and L zeolites, beta zeolites, Mordenite zeolites, ZSM zeolites and mixtures thereof. 10. A cigarette of claim 5, wherein said adjunct has pores to provide surface areas in excess of about 20 m 2 /g. 11. A cigarette of claim 10, wherein said pores have an average diameter of less than about 20 nm. 12. A cigarette of claim 4, wherein said catalyst is a finely divided particulate with an average particle size less than about 30 μm. 13. A cigarette of claim 4, wherein said catalyst has a particle size less than about 1.0 μm when said catalyst particles are fixed to surfaces of said adjunct. 14. A cigarette of claim 13, wherein the relative amounts of said catalyst fixed to said adjunct is ranges from about 1 to 75% by weight based on the total equivalent catalyst and adjunct content. 15. A cigarette of claim 14, wherein the relative amounts of said catalyst fixed to said adjunct ranges from about 20 to 70% by weight based on the total equivalent catalyst and adjunct content. 16. A cigarette of claim 1, wherein said catalyst is selected from the group consisting of transition metal oxides, rare earth metal oxides and mixtures thereof. 17. A cigarette of claim 16, wherein said transition metal oxides are selected from the group consisting of oxides of group IVB, VB, VIB,VIIB, VIII, IB metals and mixtures thereof. 18. A cigarette of claim 17, wherein said transition metal oxide is selected from the group consisting of oxides of iron, copper, silver, manganese, titanium, zirconium, vanadium and tungsten. 19. A cigarette of claim 18, wherein said transition metal oxide is iron oxide. 20. A cigarette of claim 16, wherein said rare earth metal oxides are selected from the group consisting of oxides of scandium, yttrium, lanthanide metals and mixtures thereof. 21. A cigarette of claim 20, wherein said lanthanide metal oxide is cerium oxide. 22. A cigarette of claim 21, wherein said cerium oxide is admixed with zeolite as said adjunct. 23. A cigarette of claim 21, wherein said cerium oxide is provided as a layer adjacent to a layer of zeolite. 24. A cigarette of claim 21, wherein said composition comprises cerium oxide particles fixed to surfaces of zeolite particles. 25. A cigarette of claim 21, wherein a metal or metal oxide oxidation catalyst is used with said cerium oxide, said metal or metal oxide being selected from the group consisting of oxides of precious metals, transition metals, rare earth metals, metals from groups IIA, IV A, and mixtures thereof. 26. A cigarette of claim 25, wherein said selected metal or metal oxide is platinum, palladium, copper oxide, iron oxide, magnesium oxide, silver oxide, or mixtures thereof. 27. A cigarette of claim 1, wherein a first amount of cerium oxide in said treatment composition is said adjunct and a second amount of said cerium oxide in said treatment composition is said catalyst. 28. A cigarette of claim 1, wherein said treatment material comprises from about 10% to about 500% by weight of said treatment composition. 29. A cigarette of claim 1, wherein said treatment material comprises loadings of from about 2.5 g/m 2 to about 125 g/m 2 of said treatment composition. 30. A cigarette of claim 1 further comprising a processing aid selected from the group consisting of zirconium fibres and zirconium/cerium fibres. 31. A low sidestream smoke cigarette comprising a conventional tobacco rod and a non-combustible treatment material for said rod, wherein said treatment material has a porosity less than about 200 Coresta units and a sidestream smoke treatment composition comprising, in combination, an oxygen storage and donor metal oxide oxidation catalyst and an essentially non-combustible finely divided porous zeolite adjunct for said catalyst. 32. A cigarette of claim 31 further comprising a processing aid selected from the group consisting of zirconium fibres and zirconium/cerium fibres.