A smoking article (10) comprises a tobacco rod (12) and a filter (14) connected to the tobacco rod. The filter comprises a first filter segment (20) comprising one or more breakable capsules, wherein each breakable capsule comprises an outer shell and an inner core containing an additive. The filter further comprises a hollow tube segment (22) downstream of the first filter segment and positioned between a downstream end of the first filter segment and the mouth end of the filter. The hollow tube segment defines a cavity (24) at the mouth end of the filter (14). The hollow tube segment has a wall thickness of at least 150 micrometres. The ovality of the hollow tubular segment after a 50% deformation of the filter is less than 25%.
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