Each time I think of you, I pick some branches of the tree and burn them in the fire; it is nice to cough with smoke, as if it were your memento. (Shin-Kokin Wakashu (New Collection of Ancient and Modem Times) Volume No. 8, "Song of sorrow").
思ひ出づる折りたく柴の夕煙むせぶもうれし忘れ形見に（新古今和歌集巻第八『哀傷歌』）に由来する。