An apparatus arranged to heat smokable material to volatilise at least one component of the smokable material, the apparatus comprising: a housing having a first opening at a first end through which a consumable article containing smokable material can be removably inserted into the apparatus; a collar defining or surrounding the first opening; at least one heater arrangement arranged within the housing for heating smokable material within the consumable article when in use; a hollow chamber between the first opening and the at least one heater arrangement, the hollow chamber surrounding at least a portion of the consumable article when the consumable article is inserted into the apparatus, wherein an inner wall of the hollow chamber and the at least a portion of the consumable article define an air gap there between, wherein the hollow chamber comprises a first open end and a second open end, and wherein the hollow chamber is arranged so that the first open end is positioned towards the first opening of the apparatus and the second open end is positioned towards the heater arrangement; the collar comprises a plurality of ridges arranged circumferentially around the first opening and which project into the first opening; a control circuitry configured and arranged to control the heating of the smokable material in the consumable article; and a power source comprising a battery, wherein the battery is electrically coupled to the heater arrangement to supply electrical power when required and under control of the control circuitry to heat the smokable material in the consumable article to volatise the smokable material without causing the smokable material to burn; characterised in that: the heater arrangement comprises a heating tube and the second open end of the hollow chamber engages with an end of the heating tube; and in that, when the apparatus is in use, the apparatus comprises a ventilation pathway defined by a first neighbouring pair of the plurality of ridges that allows air to flow into the air gap between the consumable article and the hollow chamber and/ or hot vapours that have escaped from the consumable article to flow out of the apparatus. a housing having a first opening at a first end through which a consumable article containing smokable material can be removably inserted into the apparatus; a collar defining or surrounding the first opening; at least one heater arrangement arranged within the housing for heating smokable material within the consumable article when in use; a hollow chamber between the first opening and the at least one heater arrangement, the hollow chamber surrounding at least a portion of the consumable article when the consumable article is inserted into the apparatus, wherein an inner wall of the hollow chamber and the at least a portion of the consumable article define an air gap there between, wherein the hollow chamber comprises a first open end and a second open end, and wherein the hollow chamber is arranged so that the first open end is positioned towards the first opening of the apparatus and the second open end is positioned towards the heater arrangement; the collar comprises a plurality of ridges arranged circumferentially around the first opening and which project into the first opening; a control circuitry configured and arranged to control the heating of the smokable material in the consumable article; and a power source comprising a battery, wherein the battery is electrically coupled to the heater arrangement to supply electrical power when required and under control of the control circuitry to heat the smokable material in the consumable article to volatise the smokable material without causing the smokable material to burn; characterised in that: the heater arrangement comprises a heating tube and the second open end of the hollow chamber engages with an end of the heating tube; and in that, when the apparatus is in use, the apparatus comprises a ventilation pathway defined by a first neighbouring pair of the plurality of ridges that allows air to flow into the air gap between the consumable article and the hollow chamber and/ or hot vapours that have escaped from the consumable article to flow out of the apparatus. the heater arrangement comprises a heating tube and the second open end of the hollow chamber engages with an end of the heating tube; and in that, when the apparatus is in use, the apparatus comprises a ventilation pathway defined by a first neighbouring pair of the plurality of ridges that allows air to flow into the air gap between the consumable article and the hollow chamber and/ or hot vapours that have escaped from the consumable article to flow out of the apparatus.