Marlboro was a brand of cigarettes.
Jack Harkness found a packet of Marlboro cigarettes in a tramp's carrier bag. (PROSE: Border Princes)
During his travels, the Eighth Doctor acquired a packet of Marlboro cigarettes, which he later left in the Institute of Time. A friend of the Doctor's, the Hive, asphyxiated itself using the packet of cigarettes. (PROSE: The End)
Ellen once had a packet of Marlboros, only to find that it was empty. (PROSE: Hospitality)