An apparatus for controlling a driver for a mist inhalation pod for delivering a mist including nicotine. The apparatus comprises a main printed circuit board (PCB) and a controller mounted to the main PCB, the controller including a processor and a memory, the memory storing executable instructions which, when executed by the processor, control at least one function of the apparatus. The apparatus comprises a load driver circuit mounted to the main PCB, the load driver circuit being configured to generate a load drive signal to control generation of the mist in the mist inhalation pod, the mist including nicotine. The apparatus comprises a fuel gauge circuit configured to monitor the charge level of a battery. The apparatus further comprises first and second switches that are controllable by the controller to electrically connect/disconnect the load driver circuit and the fuel gauge circuit to the battery. The load driver circuit and the fuel gauge circuit are disconnected when the load driver circuit and the fuel gauge circuit are not in use to minimise power consumption by the battery.