1. Patent Claims 1. Smokable product comprising a combustible material based on cellulose, characterised in that the smokable product contains metal (ill) chelate compounds of alkaline earth metals and/or of manganese (II) , the "metal (ill) chelate compounds" being complex anions which contain trivalent iron or aluminium as the central atom and anions of chelate-forming organic carboxylic acids as ligands. 2„ Smokable product according to claim 1, characterised in that it contains chelate compounds of the general formula (i): Kz [Mex Ry] (Ϊ) in which; K represents magnesium, calcium or manganese (II ) , Me represents trivalent iron or aluminium, R represents the radical of a chelate-forming organic carboxylic acid, x and y_ denote small integers which depend on the stoichiometric composition of the anion complex which is formed, and z indicates the number of divalent cations K. 3. Smokable product according to claims 1 and 2, characterised in that it contains magnesium-metal (ill) chelate compounds , ¾. Smokable product according to claims 1 to 3, characterised in that the chelate compounds contain, as chelate-forming organic carboxylic acids, carboxylic acids which contain 2 to 8 carbon atoms and which in addition to b ou contain at least on h d ox l ou 5. Smokable product according to claims 1 to t characterised in that the chelate compounds contain dicarboxyl acids or hydroxycarboxylic acids as chelate-forming carboxylic acid. 6. Smokable product according to claims 1 to 5» characterised in that the chelate-forming carboxylic acids contained in the chelate compounds are monodicarboxylic acids and dicarboxylic acids derived from pentoses and hexoses. 7. Smokable product according to claims 1 to 6, characterised in that the chelate-forming carboxylic acids contained in the chelate compounds are oxalic acid, glyceric acid, glycol^ic acid, malic acid, tartaric acid, citric acid, galactaric acid and saccharic acid. 8. Smokable product according to claims 1 to 7, characterised in that the smokable product contains magnesium-iron(lll) glycol/ate , magnesium-iron(lIl)-oxalate , magnesium-iron(lll) citrate, magnesium-iron(III)tartrate , magnesium-iron(III)galactarate , magnesium-iron(III) saccharate , magnesium-aluminium glycol/iate, magnesium-aluminium oxalate, magnesium-aluminium citrate, magnesium-aluminium tartrate, magnesium-aluminium galactarate, magnesium-aluminium-saccharat manganese-iron(III) glycol^ate, manganese-iron(III) oxalate, manganese-iron(ill) citrate, manganese-iron(ill) tartrate, manganese-iron(III) galactarate, manganese-iron(ill) saccharate, manganese-aluminium glycol^ate, manganese-aluminium oxalate, manganese-aluminium citrate, manganese-aluminium tartrate, manganese-aluminium galactarate, manganese-aluminium saccharate. 9. Smokable product according to claims 1 to 8, characterised in that, in the general formual (I), x represents 1 or 2, v_ represents integers of from 1 to and z represents the number of divalent cations K per anion, which number depends on the free negative charges remaining in the anion complex. 10 „ Smokable product according to claims 1 to 9, characterised in that the combustible material used is cellulose-containing plant material, in particular tobacco, tobacco waste products, decomposed cellulose-containing-plant material, cellulose or cellulose derivatives, alone or in mixtures. 11. Smokable product according to claims 1 to 10, characterised in that the product contains about 0.5 to 70$ b weight of chelate compound based on the total weight of combustible material. 12. Smokable product according to claims 1 to 11, characterised in that the product contains about 5 to 5 $ by weight of chelate compound based on the total weight of combustible material. 13. Smokable product according to claims 1 to 12, characterised in that the smoking product contains in addition a filler. 14. Smokable product according to claim 13, characterised in that minerals and salts which are inert under the condition of smoking, and hydroxides and hydrated oxides which split off 15* Smokable product according to claims 13 and 14, characterised in that the fillers used are hydrated oxides of aluminium and/or silicic acid. 16. Smokable product according to claims 13 to 15» characterised in that the fillers are used in quantities of about 1 to 70$ by weight, based on the total weight of smokable product. 17. Smokable product according to claims 1 to 16, characterised in that the smokable product contains in addition compounds which split off ammonia under smoking conditions . 18. Smokable product according to claim 17, characterised in that the compounds which split off ammonia are ammonia salts or inorganic acids and organic carboxylic acids and salts of amino acids and acid amides. 19. Smokable product according to claims 17 and 18, characterised in that acid and neutral ammonium salts of carbonic acid, nitric acid and phosphoric acid are used. 20. Smokable product according to claims 17 and 18, characterised in that the ammonium salts used are organic carboxylic acids which have a carbon/oxygen ratio of about 2:1 to 1:2 in the summation formula. 21. Smokable product according to claims 17, 18 and 20, characterised in that the compound which splits off ammonia is ammonium citrate and/or ammonium tartrate. 22. Smokable product according to claims 17 and 18, characterised in that the compounds which split off ammonia are ammonium salts, magnesium salts or manganese salts of amino-acids . 23. Smokable product according to claims 17, 18 and 22, characterised in that the compound which splits off ammonia is magnesium glutamate. 2k, Smokable product according to claims 17 and 18, characterised in that the compound which splits off ammonia is urea. 25. Smokable product according to claim 17, characterised in that the compounds which split off ammonia are the ammonium salts corresponding to the chelate compounds used according to the invention. 26. Smokable product according to claims 17 and 25, characterised in that the compounds which split off ammonia are ammonium-iro (ill) glycol^ate, ammonium-iron(ill) oxalate, ammonium-iron (ill) citrate, ammonium- iron( III) tartrate, ammonium-iron-(lll) galactarate, ammonium-iron (ill) saccharate, ammonium-aluminium glycol/ate, ammonium-aluminium oxalate, ammonium-aluminium citrate, ammonium-aluminium tartrate, ammonium-aluminium galactarate and ammonium-aluminium saccharate. 27. Smokable product according to claims 17 to 26, characterised in that the compounds which split off ammonia are contained in the product in such quantities that the smoke is 28. Smokable product according to claims 1 to 27, characterised in that the product contains in addition 0.01 to 7$ by weight, based on the total weight, of an oxidizing agent. 29· Smokable product according to claim 28, characterised in that the product contains oxidizing agents in quantities of 1 to 5 by weight, based on the total weight. 30. Smokable product according to claims 28 and 29, characterised in that the oxidizing agents used are alkali metal or alkaline earth metal nitrates. 31. Smokable product according to claims 28 and 29, characterised in that the oxidizing agents used are alkali metal permanganates. 32. Smokable product according to claims 1 to 31, characterised in that the product contains in addition about 0.01 to 10$ by weight of ammonium salts of polygalacturonic acids and/or ammonium salts of carboxymethylcellulose . 33. Smokable product according to claim 32, characterised in that the polygalacturonic acid used is pectin, alginic acid or gum arable. 34. Smokable product according to claims 1 to 33, characterised in that the product contains 0.01 to 5 by weight of proteins which have a low sulphur content. 35 Smokable product according to claim 3½, characterised in that the proteins with a low sulphur content used are zein, hordein or gliadin. 36. Smokable product according to claims b " h and 35 , characterised in that alcoholic extracts of the low sulphur proteins are used. 37. Smokable product according to claims 1 to 36 , characterised in that the product contains about 0.1 to 50$ by weight of tobacco constituents, based on the total weight of the product. 38. Smokable product according to claims 1 to 37 , characterised in that the products according to the invention are in the form of paper-like webs with a surface weight of 10 to 250 g/m2 and a thickness of 10 to 120 u. 39. Process for the production of smokable products, characterised in that metal (ill)-chelate compounds of alkaline earth metals and/or of manganese (il) are introduced into a combustible material based on cellulose, the metal (III)-chelate compounds being complex anions which contain trivalent iron or aluminium as the central atom and anions of chelate-forming organic carboxylic acids as ligands. 40. Process according to claim 39 , characterised in that chelate compounds of the general formula (I): are introduced in which: K represents magnesium calcium or manganese (il); Me represents trivalent iron or aluminium; R represents the radical of a chelate-forming organic carboxylic acid; 41. Process according to claims 39 and 40, characterised in that magnesium-metal (ill) chelate compounds are introduced. 42. Process according to claims 39 to 41 characterised in that chelate compounds are used which contain, as chelate-forming carboxylic acids, organic carboxylic acids which contain 2 to 8 carbon atoms and which in addition to the carboxyl group contain at least one hydroxyl group, keto group or additional carboxyl group. 3. Process according to claims 39 to 42, characterised in that chelate compounds are used in which the chelate-forming carboxylic acids are dicarboxylic acids or hydroxycarbox lic acids o 44. Process according to claims 39 to 43, characterised in that chelate compounds are used in which the chelate forming carboxylic acids are mono- and dicarboxylic acids derived from pentoses and hexoses. 45. Process according to claims 39 to 44, characterised in that chelate compounds are used in which the chelate-forming carboxylic acid is oxalic acid, glyceric acid, glycol/ic acid, tartaric acid, citric acid, galactaric acid or saccharic acid. 46. Process according to claims 39 to 45, characterised in that the chelate-forming compounds introduced are magnesium iron (ill) glycol ate, magnesium-iron (ill) oxalate magnesium-iron (III) citrate, magnesium-iron (ill) tartrate, magnesium-iron (ill) galactarate, magnesium-iron (ill) saccharate, magnesium-aluminium glycol,_tate , magnesium aluminium oxalate, magnesium-aluminium citrate, magnesium-aluminium tartrate, magnesium-aluminium galactarate, magnesium-aluminium saccharate, manganese-iron(lll) glycol ate, manganese-Iron (ill) oxalate, manganese-iron (ill) citrate, manganese-iron (ill) tartrate, manganese-iron (ill) galactarate, manganese-iron (ill) saccharate, manganese-aluminium glycol^ate, manganese-aluminium oxalate, manganese-aluminium citrate, manganese-aluminium tartrate, manganese-aluminium galactarate and manganese-aluminium saccharate. 47. Process according to claims 39 to 4(5, characterised in that chelate compounds according to the general formula (i) are used in which x represents 1 or 2, _ represents integers of from 1 to 4 and z represents the number of divalent cations K per anion, which depends on the free negative charges remaining in the anion complex. 48. Process according to claims 39 to 47, characterised in that the combustible material used is cellulose-containing plant material, in particular tobacco, tobacco waste products, decomposed cellulose-containing plant material, cellulose or cellulose derivatives, either alone or as mixtures. 49. Process according to claims 39 to 48, characterised in that the chelate compounds used according to the invention are introduced in quantities of about 0.5 to by weight, based on the total weight of combustible material. 50. Process according to claims 39 to 49, characterised in that the chelate compounds used according to the invention are introduced in quantities of about 5 to 50 by weight based on the total weight of combustible material. 51. Process according to claims 39 to 50 , characterised in that the chelate compounds used according to the invention are applied to the combustible material in the form of aqueous solutions by spraying, painting or immersion followed by drying. 52. Process according to claims 39 to 51 , characterised in that the chelate compounds used are directly introduced into a casting solution. 53. Process according to claims 39 to 52 , characterised in that in addition a filler is introduced into the combustible material. 54. Process according to claim 53 , characterised in that the fillers introduced are minerals and salts which are inert under smoking conditions and hydroxides and hydrated oxides which split off water under smoking conditions. 55. Process according to claims 53 and 5 , characterised in that the fillers used are hydrated oxides of aluminium and/or silicic acid. 56. Process according to claims 53 to 55 , characterised in that the fillers are used in quantities of about 1 to 70% by weight, based on the total, weight of smokable product. 57. Process according to claims 39 to 56 , characterised in that in addition, compounds which split off ammonia under smoking conditions are introduced into the combustible material . 58. Process according to claim 57 , characterised in that the compounds which split off ammonia are ammonium salts of inorganic acids and organic carboxylic acids as well as salts of aminoacids and acid amides. 59. Process according to claims 57 and 58 , characterised in that the compounds which split off ammonia are acid and neutral salts of carbonic acid, nitric acid and phosphoric acid. 60. Process according to claims 57 and 58 , characterised in that the compounds which split off ammonia are ammonium salts of organic carboxylic acids which have a carbon/oxygen ratio of about 2 : 1 to 1 : 2 in the summation formula. 61. Process according to claims 57 , 58 and 60 , characterised in that the compound which splits off ammonia is ammonium citrate and/or ammonium tartrate. 62. Process according to claims 57 and 58 , characterised in that the compounds which split off ammonia are ammonium, magnesium or manganese salts of amino acids. 63. Process according to claims 57 , 58 and 62 , characterised in that the compound which splits off ammonia is magnesium glutamate. V 6k. Process according to claims 57 and 58 , characterised in that the Compound which splits off ammonia is urea. 65. Process according to claim 57 , characterised in that the ammonium salts which correspond to the chelate compounds used according to the invention are introduced as compounds which split off ammonia. 66. Process according to claims 57 and 65 , characterised in that the compounds which split off ammonia are ammonium-iron (ill) glycol ate, ammonium-iron (ill) oxalate, ammonium-iron (III) citrate, ammonium-iron (ill) tartrate, ammonium-iron- (ill) galactarate, ammonium-iron (ill) saccharate, ammonium-aluminium glycoliate , ammonium-aluminium oxalate, ammonium-aluminium citrate, ammonium-aluminium tartrate, ammonium-aluminium galactarate and ammonium-aluminium saccharate. 67. Process according to claims 57 to 66 , characterised in that the compounds which split off ammonia are introduced into the combustible material in such quantities that the smoke is adjusted to a pH of 5 to 8. 68. Process according to claims 39 to 67 , characterised in that 0.01 to 7$ by weight of an oxidizing agent, based on the total weight, is in addition introduced into the combustible material. 69. Process according to claim 68 , characterised in that the oxidizing agent is introduced in quantities of 1 to 5$ by weight, based on the total weight. ♦ 70. Process according to claims 68 and 69 , characterised in that the oxidizing agents used are ammonium nitrate, alkali metal nitrates or alkaline earth metal nitrates. 71 . Process according to claims 68 to 70 , characterised in that the oxidizing agents used are alkali metal permanganates . 72. Process according to claims 39 to 71 , characterised in that the smokable product contains in addition about 0.01 to 10$ by weight of ammonium salts of polygalacturonic acids and/or ammonium salts of carboxymethylcellulose. 73. Process according to claim 72 , characterised in that the polygalacturonic acids used are pectin, alginic acid or gum arable. 7½ . Process according to claims 39 to 73 , characterised in that the smokable product contains 0.01 to 5$ by weight of low sulphur proteins. 75. Process according to claim 7¾ , characterised in that the low sulphur proteins used are zein, hordeln or gliadin. 76. Process according to claims I and 75 , characterised in that alcoholic extracts of low sulphur proteins are used. 77 „ Process according to claims 39 to 76 , characterised in that about 0. 1 to $0% by weight of tobacco constituents, based on the total weight of smokable product, are introduced into the combustible material. 78. Process according to claims 39 to 76 , characterised in that the products according to the invention are produced in the form of paper-like webs with a surface weight of 10 to 250 g/m2 and a thickness of 10 to 120 p. 79. Use of smokable products according to claims 1 38, alone or as mixing components, in cigarette tobacco, cigar tobacco or pipe tobacco. 80. Use of smoking products according to claims 1 t as cigarette paper or cigar wrappers. For the Applicants PR. REINHQID COHN AND PART ERS Le A 14 086 - 57 -