FIELD: smoking accessories.SUBSTANCE: group of inventions finds specific application as a cartridge assembly containing a nicotine source and an acid source for generating an aerosol containing nicotine salt particles. Cartridge assembly for use in an aerosol-generating system, wherein the cartridge assembly comprises a cartridge and a mouthpiece. Cartridge comprises cartridge housing and cartridge cover. Cartridge case has first side defining first recess and second side defining second recess. Cartridge cover comprises cartridge cover cavity, cartridge cover opening on downstream end of cartridge cover cavity, a part in the form of a wall of the cartridge cover and a hole for the actuating part in the part in the form of a wall of the cartridge cover for placement of the actuating part of the device generating the aerosol. In cartridge cover cavity cartridge housing is installed with possibility of shift. Portion of cartridge cover wall part extends along upstream end of cartridge cover cavity and comprises cartridge air inlet opening. Mouthpiece has a mouthpiece cavity in which the downstream end of the cartridge is placed. Cartridge is configured such that when the aerosol generating device actuator portion is located at the cartridge housing through the actuating portion opening, cartridge body is shifted in cartridge cover space from first position to second position. In the first position, the upstream end of the cartridge housing rests against the cartridge cover wall portion and closes the cartridge cover air inlet, and downstream end of cartridge housing rests against downstream end of cartridge cover and closes opening of cartridge cover. In second position upstream end of cartridge housing is spaced apart with part in form of wall of cartridge cover, and downstream end of cartridge housing is spaced apart with downstream end of cartridge cover, and, therefore, the cartridge cover air inlet port is in fluid communication with the cartridge cover opening b
