An aerosol-generating article is provided, including a rod of aerosol-generating substrate; an aerosol-cooling element downstream of the rod and including a hollow tubular segment including a peripheral wall, the segment extending along a longitudinal axis and having a downstream end in fluid communication with an upstream end, the segment further including at least one elongated protrusion extending from the peripheral wall into an interior of the segment, the protrusion extending longitudinally from an upstream position on the wall to a downstream position on the wall; and a wrapper circumscribing the rod and the aerosol-cooling element, the protrusion being a deflecting fin configured to change a direction of flow of an aerosol flowing from the upstream to the downstream end the segment, and the fin being twisted along a length of the segment.