An aerosol-generating system comprising: a cartridge comprising a cartridge housing , a solid aerosol-forming substrate positioned within the cartridge housing and a liquid aerosol-forming substrate positioned within the cartridge housing ; and an aerosol-generating device comprising: a cavity for receiving at least a portion of the cartridge , wherein the cavity is configured for insertion of the cartridge into the cavity along a first direction ; a liquid transfer element extending from an end wall of the cavity , the liquid transfer element having a longitudinal axis extending substantially parallel to the first direction , wherein the aerosol-generating system is configured so that a portion of the liquid transfer element contacts the liquid aerosol-forming substrate when the cartridge is received within the cavity ; an electric heater comprising a resistive heating coil wrapped around a portion of the liquid transfer element , wherein the resistive heating coil is wrapped around the longitudinal axis of the liquid transfer element ; and a power supply and a controller for controlling a supply of electrical power from the power supply to the electric heater . a cartridge comprising a cartridge housing , a solid aerosol-forming substrate positioned within the cartridge housing and a liquid aerosol-forming substrate positioned within the cartridge housing ; and an aerosol-generating device comprising: a cavity for receiving at least a portion of the cartridge , wherein the cavity is configured for insertion of the cartridge into the cavity along a first direction ; a liquid transfer element extending from an end wall of the cavity , the liquid transfer element having a longitudinal axis extending substantially parallel to the first direction , wherein the aerosol-generating system is configured so that a portion of the liquid transfer element contacts the liquid aerosol-forming substrate when the cartridge is received within the cavity ; an electric heater comprising a resistive heating coil wrapped around a portion of the liquid transfer element , wherein the resistive heating coil is wrapped around the longitudinal axis of the liquid transfer element ; and a power supply and a controller for controlling a supply of electrical power from the power supply to the electric heater . a cavity for receiving at least a portion of the cartridge , wherein the cavity is configured for insertion of the cartridge into the cavity along a first direction ; a liquid transfer element extending from an end wall of the cavity , the liquid transfer element having a longitudinal axis extending substantially parallel to the first direction , wherein the aerosol-generating system is configured so that a portion of the liquid transfer element contacts the liquid aerosol-forming substrate when the cartridge is received within the cavity ; an electric heater comprising a resistive heating coil wrapped around a portion of the liquid transfer element , wherein the resistive heating coil is wrapped around the longitudinal axis of the liquid transfer element ; and a power supply and a controller for controlling a supply of electrical power from the power supply to the electric heater . <EOS>