Here "my days" refers to the author's life and the idea of "smoke" is something that quickly disappears. AT: "my life passes away quickly" (See: [[rc://en/ta/man/translate/figs-simile]])
Here the author refers to his "body" as his "bones." AT: "my body feels like it is burning" (See: [[rc://en/ta/man/translate/figs-synecdoche]] and [[rc://en/ta/man/translate/figs-simile]])