A nebulizer unit includes a housing, an aerosol generator, and an exchangeable mouthpiece. The aerosol generator is supported within the housing by a sealing ring and a retaining structure, and includes an outlet end having an integrally formed mouthpiece connector. The exchangeable mouthpiece is configured to be received by the mouthpiece connector. One side of the mouthpiece includes at least one air channel, each air channel having a first end that opens into an aerosol chamber. The aerosol chamber is delimited at an end face by the aerosol generator and circumferentially by the mouthpiece connector and the mouthpiece.
