Electronic smoking device, comprising: an elongate housing sleeve having a first end and a second end, a section provided separate from the housing sleeve, in which an electrically activatable atomizer including an electric heater and a reservoir containing a liquid are arranged, and an elongate insert that is configured to fit into the housing sleeve via one of the ends (62, 64) of the housing sleeve, wherein the following components are mounted on the insert: - a rechargeable battery as an electric power source adapted to power the electrically activatable atomizer, - control electronics connected to a puff detector and adapted to control the heater of the atomizer, wherein the puff detector is adapted to detect a user requesting the generation of an aerosol, - a charging port for charging the battery, wherein the charging port is mounted at a first end of the insert which is located in the area of a first end of the housing sleeve, and - a connector, which is mounted at a second end of the insert which is located in the area of the second end of the housing sleeve when the insert is fitted into the device, wherein - the connector is adapted to provide a connection to the section of the electronic smoking device, which comprises the atomizer and the reservoir, and - the connector includes electrical connections for the atomizer and is adapted to provide a mechanical connection to the section of the electronic smoking device, which comprises the atomizer. an elongate housing sleeve having a first end and a second end, a section provided separate from the housing sleeve, in which an electrically activatable atomizer including an electric heater and a reservoir containing a liquid are arranged, and an elongate insert that is configured to fit into the housing sleeve via one of the ends (62, 64) of the housing sleeve, wherein the following components are mounted on the insert: - a rechargeable battery as an electric power source adapted to power the electrically activatable atomizer, - control electronics connected to a puff detector and adapted to control the heater of the atomizer, wherein the puff detector is adapted to detect a user requesting the generation of an aerosol, - a charging port for charging the battery, wherein the charging port is mounted at a first end of the insert which is located in the area of a first end of the housing sleeve, and - a connector, which is mounted at a second end of the insert which is located in the area of the second end of the housing sleeve when the insert is fitted into the device, wherein - the connector is adapted to provide a connection to the section of the electronic smoking device, which comprises the atomizer and the reservoir, and - the connector includes electrical connections for the atomizer and is adapted to provide a mechanical connection to the section of the electronic smoking device, which comprises the atomizer. - a rechargeable battery as an electric power source adapted to power the electrically activatable atomizer, - control electronics connected to a puff detector and adapted to control the heater of the atomizer, wherein the puff detector is adapted to detect a user requesting the generation of an aerosol, - a charging port for charging the battery, wherein the charging port is mounted at a first end of the insert which is located in the area of a first end of the housing sleeve, and - a connector, which is mounted at a second end of the insert which is located in the area of the second end of the housing sleeve when the insert is fitted into the device, wherein - the connector is adapted to provide a connection to the section of the electronic smoking device, which comprises the atomizer and the reservoir, and - the connector includes electrical connections for the atomizer and is adapted to provide a mechanical connection to the section of the electronic smoking device, which comprises the atomizer.