From the options provided, the most urgent status would be obstructed airway. An obstructed airway is a critical emergency that can lead to suffocation and requires immediate intervention.
While smoke inhalation and coughing up blood are also serious and require prompt medical attention, an obstructed airway is the most immediate threat to life. A urinary tract infection, while it can be painful and require treatment, is generally not considered urgent in the same way as the other conditions listed.