A kit comprising a module and an electrically operated aerosol-generating system , the electrically operated aerosol-generating system comprising: an electric heater for heating an aerosol-generating substrate; a supply of electrical energy; a data coupling ; and a system attachment connector; the module comprising: a data connector for connecting to the data coupling of the electrically operated aerosol-generating system ; at least one module data storage device configured for at least one of: storing data comprising a set of instructions for execution by a microprocessor; storing data for transmission to the electrically operated aerosol-generating system via the data connector ; and storing data received from the electrically operated aerosol-generating system via the data connector ; and a module attachment connector for cooperating with the system attachment connector on the electrically operated aerosol-generating system for attaching the module to the electrically operated aerosol-generating system ; wherein external dimensions of the module define a first volume, wherein external dimensions of the electrically operated aerosol-generating system define a second volume, and wherein the second volume is greater than the first volume. an electric heater for heating an aerosol-generating substrate; a supply of electrical energy; a data coupling ; and a system attachment connector; the module comprising: a data connector for connecting to the data coupling of the electrically operated aerosol-generating system ; at least one module data storage device configured for at least one of: storing data comprising a set of instructions for execution by a microprocessor; storing data for transmission to the electrically operated aerosol-generating system via the data connector ; and storing data received from the electrically operated aerosol-generating system via the data connector ; and a module attachment connector for cooperating with the system attachment connector on the electrically operated aerosol-generating system for attaching the module to the electrically operated aerosol-generating system ; wherein external dimensions of the module define a first volume, wherein external dimensions of the electrically operated aerosol-generating system define a second volume, and wherein the second volume is greater than the first volume. a data connector for connecting to the data coupling of the electrically operated aerosol-generating system ; at least one module data storage device configured for at least one of: storing data comprising a set of instructions for execution by a microprocessor; storing data for transmission to the electrically operated aerosol-generating system via the data connector ; and storing data received from the electrically operated aerosol-generating system via the data connector ; and a module attachment connector for cooperating with the system attachment connector on the electrically operated aerosol-generating system for attaching the module to the electrically operated aerosol-generating system ; wherein external dimensions of the module define a first volume, wherein external dimensions of the electrically operated aerosol-generating system define a second volume, and wherein the second volume is greater than the first volume. <EOS>