A smoking system comprising a consumable containing a smokable substance and a device that heats and atomizes the smokable substance , wherein the device includes a chamber that receives the consumable , and a heating unit that heats the consumable received into the chamber , the chamber includes an opening through which the consumable is inserted into the chamber in a longitudinal direction of the chamber and a holding unit that holds the consumable , the holding unit includes two or more first pressing units in a circumferential direction of the chamber , which press a part of the consumable , and a non-pressing unit , the first pressing units and the non-pressing unit each have an inner surface and an outer surface , wherein the inner surface of each of the first pressing units is a flat surface extending along the longitudinal direction of the chamber and having the same distance from the longitudinal axis of the chamber , the consumable includes a first portion (S1) having a first hardness and a second portion (S2) having a second hardness, in which the second portion (S2) is a different portion from the first portion (S1) in an insertion direction of the consumable , when the consumable is positioned at a desired position in the chamber , the consumable is positioned such that at least a part of the first portion (S1) is pressed against the inner surfaces of the first pressing units , while at the same time, at least a part of the second portion (S2) is pressed against the inner surfaces of the first pressing units , the second portion (S2) includes a cylindrical member , and the cylindrical member is a paper tube or a hollow filter. the device includes a chamber that receives the consumable , and a heating unit that heats the consumable received into the chamber , a chamber that receives the consumable , and a heating unit that heats the consumable received into the chamber , the chamber includes an opening through which the consumable is inserted into the chamber in a longitudinal direction of the chamber and a holding unit that holds the consumable , the holding unit includes two or more first pressing units in a circumferential direction of the chamber , which press a part of the consumable , and a non-pressing unit , the first pressing units and the non-pressing unit each have an inner surface and an outer surface , wherein the inner surface of each of the first pressing units is a flat surface extending along the longitudinal direction of the chamber and having the same distance from the longitudinal axis of the chamber , the consumable includes a first portion (S1) having a first hardness and a second portion (S2) having a second hardness, in which the second portion (S2) is a different portion from the first portion (S1) in an insertion direction of the consumable , when the consumable is positioned at a desired position in the chamber , the consumable is positioned such that at least a part of the first portion (S1) is pressed against the inner surfaces of the first pressing units , while at the same time, at least a part of the second portion (S2) is pressed against the inner surfaces of the first pressing units , the second portion (S2) includes a cylindrical member , and the cylindrical member is a paper tube or a hollow filter. <EOS>