The Collaborative International Dictionary of English v.0.48:

Smoking \Smok"ing\,
   a. & n. from Smoke.
   [1913 Webster]

   Smoking bean (Bot.), the long pod of the catalpa, or
      Indian-bean tree, often smoked by boys as a substitute for
      cigars.

   Smoking car, a railway car carriage reserved for the use of
      passengers who smoke tobacco.
      [1913 Webster]

WordNet (r) 3.0 (2006):

smoking car
    n 1: a passenger car for passengers who wish to smoke [syn:
         smoker, smoking car, smoking carriage, smoking
         compartment]