What do the cigarettes and the chestnuts symbolize in "Cranes"?

Both
the cigarettes and the chestnuts are symbolic of friendship in the short story "."
 

The two items are not only symbolic of the friendship that exists between
Songsam and Tokchae, but the two items are also symbolic of different times.  Toward the
beginning of the story, the author does a brief flashback to when the two men were young boys.
 One of the things that the boys used to do together was steal chestnuts from another villager's
tree.  Songsam was caught in the act and had to flee; therefore,...