SMOKING ARTICLE FILTER WITH ANNULAR RESTRICTOR AND DOWNSTREAM VENTILATION

摘要

A smoking article 10 includes a tobacco rod 12 adapted to produce mainstream smoke, and a filter 14 having an upstream end portion 20 and a downstream end portion 25. The filter includes a ventilated cavity 46 and a flow restrictor segment 26 having an impermeable insert 18 at least partially surrounded by a tubular segment 30 of an air transmissive material upstream of the cavity. The tubular segment at least partially defines the cavity. A method of making such a smoking article is disclosed.