Abstract: A coaxially integrated swirl guiding acoustic device has an elongated annular housing with radially spaced outer and inner walls. At least one acoustic resonator chamber is enclosed between the outer and inner walls. A swirl guiding structure is coaxially arranged within an open interior of the housing and secured to the inner wall of the housing, the structure having at least one swirl guiding element configured to modify swirl characteristics of air flowing through the device.

Abstract: The invention relates to smoking behaviour analyser that allows a puff by puff real time analysis of a person's smoking behaviour whilst smoking. The device comprises smoking article mounting means for holding a smoking article in fluid-flow communication with fluid flow pressure drop detection means and smoke density detection means for detecting the optical density of the smoke; signal conversion means to convert signals obtained from the fluid flow pressure drop detection means and smoke density detection means into data; and data processing means operable to process data and provide a calculation of a delivery value of particulate phase smoke components from a smoking article. The data is displayed in graphical and/or numerical form.