The speaker looks back on his smoking days and finds a kinship with the humble book match. Both come from books, in a sense: the speaker as the child of a writer and a librarian, the match as a little cardboard strip torn from its cover. Once torn away, neither can return. The speaker, hooked on cigarettes, feels cut off from clean air, an "exile" of a different kind.
The poem plays with comparisons. Both "lose their heads," and the speaker's thinness, "skinny as a heron's leg," echoes the flimsy match. The last stanza turns on a riddle. The "minimal page" holds room for one word that begins with a lowercase L and ends in "incandescence." The poem never names it, but the clues point to "light." Calling it "holy" and "profane" gives it a double life. The closing admission, that overuse has worn the word out, feels wry and a little sad. The mood is gentle, rueful and playful, with a hint of lingering loss.