Some embodiments provide an electronic vapour provision system comprising a vaporiser for vaporising liquid for inhalation by a user of the electronic vapour provision system； a power supply comprising a cell or battery for supplying power to the vaporiser； a sensor for detecting airflow through the electronic vapour provision system as a result of the inhalation by the user； a manual activation device； and a control unit for causing power to be supplied to the vaporiser to vaporise the liquid providing the control unit determines that both (i) the sensor is detecting airflow through the electronic vapour provision system and (ii) the manual activation device has been manually activated by the user.
