A consumable for a smoking substitute device, the consumable comprising: a tank, for storing vapourisable liquid; a heater assembly, the heater assembly having an inlet and two or more outlets; and a connector, which is connected to the heater assembly, and which provides at least two airflow paths (410, 412), each extending from a respective outlet of the heater assembly to an inlet of an airway tube; wherein each airflow path has a first cross-section, located proximal to the respective outlet of the heater assembly, and a second cross-section, located proximal to the airway tube, and wherein the first cross-section is larger than the second cross-section such that each airflow path through the connector narrows in a direction from the heater assembly to the airway tube; and wherein the consumable includes a fixed baffle, which at least partially defines the airflow paths; characterised in that: the airway tube is inserted into a first end of the connector, the first end being opposite to the baffle, and the heater assembly is connected to a second end of the connector, the second end being opposite to the airway tube; and, the connector seals the heater assembly to the airway tube such that vaporisable liquid stored in the tank cannot seep into the airway tube, and such that air may flow from an interior portion of the heater assembly into an interior portion of the airway tube. a tank, for storing vapourisable liquid; a heater assembly, the heater assembly having an inlet and two or more outlets; and a connector, which is connected to the heater assembly, and which provides at least two airflow paths (410, 412), each extending from a respective outlet of the heater assembly to an inlet of an airway tube; wherein each airflow path has a first cross-section, located proximal to the respective outlet of the heater assembly, and a second cross-section, located proximal to the airway tube, and wherein the first cross-section is larger than the second cross-section such that each airflow path through the connector narrows in a direction from the heater assembly to the airway tube; and wherein the consumable includes a fixed baffle, which at least partially defines the airflow paths; characterised in that: the airway tube is inserted into a first end of the connector, the first end being opposite to the baffle, and the heater assembly is connected to a second end of the connector, the second end being opposite to the airway tube; and, the connector seals the heater assembly to the airway tube such that vaporisable liquid stored in the tank cannot seep into the airway tube, and such that air may flow from an interior portion of the heater assembly into an interior portion of the airway tube. the airway tube is inserted into a first end of the connector, the first end being opposite to the baffle, and the heater assembly is connected to a second end of the connector, the second end being opposite to the airway tube; and, the connector seals the heater assembly to the airway tube such that vaporisable liquid stored in the tank cannot seep into the airway tube, and such that air may flow from an interior portion of the heater assembly into an interior portion of the airway tube.