Patent ID: 8240315

Claim:
A smoking article comprising: a cylinder of smoking material; a hollow tube within the cylinder of smoking material; a heat sink at a downstream end of the hollow tube the heat sink including an aerosol former; a filter system attached to the heat sink, the filtering system comprising an upstream segment of filtering material and a downstream segment of filtering material in a spaced-apart relationship, and a sorbent material positioned between the upstream and the downstream segments of filtering material; and a gap between the downstream end of the hollow tube and the heat sink, wherein the upstream and the downstream segments of filtering material are cellulose acetate tow and the aerosol former is selected from a group consisting of glycerin, propylene glycol, triacetin, propylene carbonate and triethyl, and wherein the heat sink is a segment of smoking material, and the heat sink is wrapped with an impermeable encapsulating material and wherein each end of the heat sink is capped with a thin film, which melts upon exposure to heat.