Aerosol generating article and system comprising composite heat source

An aerosol generating article comprising:

• a first portion comprising a composite heat source;
• a second portion adjacent to the first portion and comprising at least one of an aerosol generating material and a tobacco material;
• a third portion comprising a cooling material;
• and
• a fourth portion comprising a filter material,
• wherein the first portion, the second portion, the third portion, and the fourth portion are sequentially arranged along a longitudinal direction of the aerosol generating article,
• wherein the composite heat source comprises a combustible heat source and a combustible wick inserted into the combustible heat source,
• wherein, when the first portion is combusted, a combustion rate of the combustible wick is greater than a combustion rate of the combustible heat source, and the combustible wick that is combusted is removed such that an air flow passage is formed in a region in which the combustible wick has been removed,
• wherein the combustible wick comprises a first region and a second region, the first region and the second region being physically connected to each other,
• wherein the first region has a uniform diameter in the longitudinal direction of the aerosol generating article, and the second region has a diameter that increases as a distance away from the first region in the longitudinal direction of the aerosol generating article increases, the diameter of the second region being equal to or greater than the uniform diameter of the first region, and
• wherein the first region is an upstream in the aerosol generating article compared to the second region.