A heat source (2) for a smoking article has an upstream end (4) and an opposed downstream end (6) and comprises a combustible carbonaceous core (8) and an integral, non-combustible, thermally insulating, peripheral layer (10). The core (8) extends from the upstream end (4) of the heat source (2) to the downstream end (6) of the heat source (2). The peripheral layer (10) extends from the upstream end (4) of the heat source (2) only part way along the length of the heat source (2) and circumscribes an upstream portion (12) of the core (8).一種用於吸煙製品之熱源(2)具有一上游端(4)及一相對下游端(6)且包括一可燃含碳芯(8)及一整體、不可燃且熱絕緣周邊層(10)。該芯(8)從該熱源(2)之上游端(4)延伸至該熱源(2)之下游端(6)。該周邊層(10)從該熱源(2)之上游端(4)沿著該熱源(2)之長度只延伸部分距離且限制該芯(8)之上游部分(12)。
