Abstract
The collection of sidestream smoke (SSS) using the “BAT fishtail chimney” method became the accepted standard, but following the harmonisation of linear and rotary smoking machines it is no longer possible to observe all parameters of the method as published. A prerequisite of any SSS collection method is that mainstream smoke (MSS) yields should not be affected. Additionally all the standard features and parameters of normal MSS collection should as far as possible remain unchanged. The previously published method and current harmonised MSS collection are not compatible mainly due to the significant increase in air-flow rate over the cigarettes that is now necessary. This study describes the use of a modified chimney that incorporates an airtight insert causing a reduction in aperture size leading to a local increase in airflow over the cigarette. The method optimises SSS collection whilst maintaining full compliance with the current International Organisation for Standardisation (ISO) Standards for MSS collection.