An electronic smoking device (10) comprises a power supply and a liquid reservoir (32). The liquid reservoir (34) comprises a body portion having a central cavity accessible via an opening; and an air tube (32) for extracting vapour from the electronic smoking device (10) provided within said central cavity and accessible via said opening; a membrane (96) having one or more slit valves (102) provided adjacent the end of the air tube (32) accessible via said opening; and an atomizer (14) operable when connected to power supply (12) to atomize liquid stored in the liquid reservoir (34).La présente invention concerne un procédé, un système et un appareil permettant de recharger un réservoir d'un dispositif de substitution pour fumeurs avec un liquide provenant d'un distributeur.