SMOKING ARTICLE WITH VALVED RESTRICTOR

摘要

A smoking article 110 comprises a tobacco rod 112 and a filter 114. The filter includes a valved flow restrictor 126 and a cavity 146 downstream of the flow restrictor. The flow restrictor includes an orifice or flow channel 130 for directing smoke into the cavity. The filter is attached to the tobacco rod with tipping paper 116 and includes an air-admissible ventilating zone 140 at a location downstream of the restrictor. The filter further comprises a valve (123, 125) which moves from a first position at which mainstream smoke freely passes through the orifice in the restrictor to a second position at which the valve partially or fully closes the orifice in the restrictor.