Segmented smoking article

A cigarette comprising:a lighting end (514) and a mouth end (518);a mouth end piece segment disposed at the mouth end;an aerosol-generation system disposed between the lighting end and the mouth end piece segment, the aerosol-generation system includinga heat generation segment (535) disposed at the lighting end having a length including a heat source (40) configured to be activated by ignition of the lighting end and an insulation layer of flame-retardant material disposed around the heat source; andan aerosol-generating segment (510) incorporating aerosol-forming material, said aerosol-generating segment having a length and being disposed between the heat generation segment and the mouth end such that the heat generation segment and the aerosol-generating segment are disposed in a heat exchange relationship with one another,characterised in that the aerosol-generating segment (510) includes a substrate (555) constructed in a multilayer fashion wherein layers are stitch-bonded together with a substrate heat-conductive material constructed to transmit heat from the heat-generation segment through the substrate to generate aroma.