An electronic cigarette comprising a generally cylindrical housing with a proximal mouth end and a distal end, and within the housing: a vaporiser to produce vapour to be delivered to the mouth end, a battery, and sensor circuitry to detect a user drawing on the mouth end and connect the battery to power the vaporiser to produce vapour, the vaporiser comprising: a tube having inlet and outlet ends and extending longitudinally of the housing, first and second supports at opposite ends of the tube for directing airflow into and out of the tube from the inlet to the outlet, wherein the first support is located at the inlet end of the tube and the second support is located at the outlet end of the tube, a porous matrix (18, 19) containing a vaporisable liquid extending around the tube, wicking fibres extending through side openings (14a,b) in the tube and configured to wick the vaporisable liquid from the porous matrix into the tube, an electrical heater coil in the tube configured to be powered by the battery to vaporise liquid on the wicking fibres in the tube, so that vapour is supplied along the tube to the outlet end when the user draws thereon, and an airflow restrictor to channel the flow of air along the tube to the heater coil, wherein the airflow restrictor is located in the tube between the first support and the heater coil. a vaporiser to produce vapour to be delivered to the mouth end, a battery, and sensor circuitry to detect a user drawing on the mouth end and connect the battery to power the vaporiser to produce vapour, the vaporiser comprising: a tube having inlet and outlet ends and extending longitudinally of the housing, first and second supports at opposite ends of the tube for directing airflow into and out of the tube from the inlet to the outlet, wherein the first support is located at the inlet end of the tube and the second support is located at the outlet end of the tube, a porous matrix (18, 19) containing a vaporisable liquid extending around the tube, wicking fibres extending through side openings (14a,b) in the tube and configured to wick the vaporisable liquid from the porous matrix into the tube, an electrical heater coil in the tube configured to be powered by the battery to vaporise liquid on the wicking fibres in the tube, so that vapour is supplied along the tube to the outlet end when the user draws thereon, and an airflow restrictor to channel the flow of air along the tube to the heater coil, wherein the airflow restrictor is located in the tube between the first support and the heater coil. a tube having inlet and outlet ends and extending longitudinally of the housing, first and second supports at opposite ends of the tube for directing airflow into and out of the tube from the inlet to the outlet, wherein the first support is located at the inlet end of the tube and the second support is located at the outlet end of the tube, a porous matrix (18, 19) containing a vaporisable liquid extending around the tube, wicking fibres extending through side openings (14a,b) in the tube and configured to wick the vaporisable liquid from the porous matrix into the tube, an electrical heater coil in the tube configured to be powered by the battery to vaporise liquid on the wicking fibres in the tube, so that vapour is supplied along the tube to the outlet end when the user draws thereon, and an airflow restrictor to channel the flow of air along the tube to the heater coil, wherein the airflow restrictor is located in the tube between the first support and the heater coil.