Smoking article with dual function cap

A smoking article, comprising:

• a rod having a first end and a second end;
• a combustible heat source located at or proximate to the second end of the rod;
• and
• a removable cap, the removable cap being removably couplable to both the first end and the second end of the rod,
• wherein in a first configuration of the smoking article the removable cap is coupled to the first end of the rod such that air may be drawn from the rod through the removable cap,
• wherein in a second configuration of the smoking article the removable cap is coupled to the second end of the rod such that the second end is at least substantially covered by the removable cap, such that in the second configuration the removable cap facilitates disposal of the smoking article after use,
• wherein the removable cap comprises a material to thermally isolate the combustible heat source when the removable cap is coupled to the second end of the rod, and
• wherein the removable cap further comprises one or more materials that, when the removable cap is coupled to the second end of the rod:
• undergo decomposition to produce a decomposition product that extinguishes the heat source, or
• undergo a phase change to consume heat energy produced by the heat source, the one or more phase change materials comprising a polymer, a wax, or both a polymer and a wax.