The state of the flavor source contained in the flavor source such as tobacco in the container is estimated without providing the sensor in the container.The flavor ingredient delivery device isContains flavoring sourcesA flavor vessel configured to emit gas and / or aerosols containing flavor components of the flavor source andA first sensor disposed upstream or downstream of the flavor vessel in a flow path toward the suction passage through the taste vesselBased on the measurement results of the first sensorA control section configured to estimate the state of the flavor source in the flavor vessel;.
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