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 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 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 . <EOS>