An electronic vapour provision system comprising a vaporiserfor vaporising liquid for inhalation by a user of the electronic vapourprovision system； a power supply for supplying power to the vaporiser tovaporisethe liquid in response to a user activation of the device； a control unitconfigured to estimate a user's expected activation duration and cause powerto besupplied to the vaporiser for a period of time shorter than a user'sactivationduration.
