Smoking article with mouth end cavity

A smoking article comprising:

• a tobacco rod;
• a filter comprising:
• a first filter segment comprising one or more breakable capsules, each breakable capsule comprising an outer shell and an inner core containing an additive;
• a hollow tube segment downstream of the first filter segment, the hollow tube segment comprising a wall with an inner wall surface defining a cavity at the mouth end of the filter, the hollow tube segment positioned between a downstream end of the first filter segment and the mouth end of the filter;
• and
• a plug wrap circumscribing the first filter segment and an outer wall surface of the hollow tube segment, wherein the plug wrap has a basis weight of less than 90 grams per square meter,
• wherein the wall of the hollow tube segment is formed from a plurality of overlapping paper layers, adjacent paper layers of the wall of the hollow tube segment being adhered together by an intermediate layer of an adhesive;
• and
• a tipping wrapper circumscribing the plug wrap and at least a portion of the tobacco rod to connect the filter to the tobacco rod.