Smoking mechanism 10, the combustion load (12) to the material as possible; It includes a flow restriction element (26, 26 ') attached to the rod 12 of the above combustible material. The flow restriction element (26, 26 ') has a first tubular portion of the single piece (30, 30') and; A first tubular portion (30, 30 ') is substantially equal to the second tubular portion (32, 32 downstream of the casting of the outer diameter to "); The first and second tubular portions (30, 30 ', 32, 32') while positioned between the first and second tubular portions together in the center with a reduced outer diameter compared to the (30, 30 ', 32, 32') a third tubular portion of the molding (34, 34 '); It includes. At least one orifice provided in the interior (38, 38 ') lateral wall (36, 36 has a') a first tubular portion 930, 30 ') the inner circumference in the upstream first at least partially formed by the It is disposed between the cavity (40, 40 ') and a second tubular portion (32, 32') at least in the downstream part formed in the second cavity (42, 42 ') by the inner circumference of. The open area is provided in communication with the second cavity (42, 42 ') at a predetermined position along said filter (14).