- An aerosol generation system for generation of an aerosol from an aerosol-forming precursor, the system comprising: - an electrically operated heating system to heat said precursor to generate the aerosol; - a flow path for transmission of flow, including the aerosol, to a user; the heating system arranged in fluid communication with the flow path; and - electrical circuitry configured to: - measure a property of the electrical energy through the heating system; characterized in that the electrical circuitry is further configured to: - determine one or more characteristics from the result of the measurement of said measured property of the electrical energy; - select, based on the determined characteristics, one from a plurality of different stored relationships between the measured property of the electrical energy and a property of the flow; and - determine the property of the flow based on said relationship, wherein the property related to the flow is an amount of one or more components of the aerosol in the flow path and wherein the characteristic is based on one of more of an: amplitude, area or period of an oscillation of a property of said electrical energy or a time derivative thereof; an initiation time of a user inhale through the flow path; a duration of a user inhale through the flow path; a duration of an application of electrical energy to the heating system. - an electrically operated heating system to heat said precursor to generate the aerosol; - a flow path for transmission of flow, including the aerosol, to a user; the heating system arranged in fluid communication with the flow path; and - electrical circuitry configured to: - measure a property of the electrical energy through the heating system; - measure a property of the electrical energy through the heating system; characterized in that the electrical circuitry is further configured to: - determine one or more characteristics from the result of the measurement of said measured property of the electrical energy; - select, based on the determined characteristics, one from a plurality of different stored relationships between the measured property of the electrical energy and a property of the flow; and - determine the property of the flow based on said relationship, - determine one or more characteristics from the result of the measurement of said measured property of the electrical energy; - select, based on the determined characteristics, one from a plurality of different stored relationships between the measured property of the electrical energy and a property of the flow; and - determine the property of the flow based on said relationship, wherein the property related to the flow is an amount of one or more components of the aerosol in the flow path and wherein the characteristic is based on one of more of an: amplitude, area or period of an oscillation of a property of said electrical energy or a time derivative thereof; an initiation time of a user inhale through the flow path; a duration of a user inhale through the flow path; a duration of an application of electrical energy to the heating system. amplitude, area or period of an oscillation of a property of said electrical energy or a time derivative thereof; an initiation time of a user inhale through the flow path; a duration of a user inhale through the flow path; a duration of an application of electrical energy to the heating system.