The Collaborative International Dictionary of English v.0.48:

Smoky \Smok"y\, a. [Compar. Smokier; superl. Smokiest.]
   1. Emitting smoke, esp. in large quantities or in an
      offensive manner; fumid; as, smoky fires.
      [1913 Webster]

   2. Having the appearance or nature of smoke; as, a smoky fog.
      "Unlustrous as the smoky light." --Shak.
      [1913 Webster]

   3. Filled with smoke, or with a vapor resembling smoke;
      thick; as, a smoky atmosphere.
      [1913 Webster]

   4. Subject to be filled with smoke from chimneys or
      fireplace; as, a smoky house.
      [1913 Webster]

   5. Tarnished with smoke; noisome with smoke; as, smoky
      rafters; smoky cells.
      [1913 Webster]

   6. Suspicious; open to suspicion. [Obs.] --Foote.
      [1913 Webster]

   Smoky quartz (Min.), a variety of quartz crystal of a pale
      to dark smoky-brown color. See Quartz.
      [1913 Webster] Smolder

WordNet (r) 3.0 (2006):

smoky
    adj 1: marked by or emitting or filled with smoke; "smoky
           rafters"; "smoky chimneys"; "a smoky fireplace"; "a smoky
           corridor" [ant: smokeless]
    2: tasting of smoke; "smoky sausages"

Moby Thesaurus II by Grady Ward, 1.0:

124 Moby Thesaurus words for "smoky":
   Quaker-colored, acier, aerial, aerodynamic, aerostatic, aery, airy,
   ashen, ashy, besmirched, blackened, blotchy, canescent, cinereous,
   cinerous, dapple, dapple-gray, dappled, dappled-gray, darkened,
   dingy, dirty, discolored, dismal, dove-colored, dove-gray, dreary,
   dull, dusty, ethereal, foxed, foxy, fuliginous, fuming, fumy,
   gaseous, gasified, gasiform, gaslike, gassy, glaucescent, glaucous,
   gray, gray-black, gray-brown, gray-colored, gray-drab, gray-green,
   gray-spotted, gray-toned, gray-white, grayed, grayish, grimy,
   griseous, grizzle, grizzled, grizzly, grubby, grungy, inky,
   iron-gray, lead-gray, leaden, livid, mephitic, messy, miasmal,
   miasmatic, miasmic, miry, mouse-colored, mouse-gray, mousy, muddy,
   murky, oxyacetylene, oxygenous, ozonic, pearl, pearl-gray, pearly,
   pneumatic, reeking, reeky, sad, scruffy, silver, silver-gray,
   silvered, silvery, slate-colored, slaty, slovenly, smirched,
   smirchy, smoke-gray, smoking, smudgy, smutchy, smutty, snuffy,
   sober, soiled, somber, sooty, stained, steaming, steamy,
   steel-gray, steely, stigmatic, stigmatiferous, stigmatized,
   stone-colored, tainted, tarnished, taupe, untidy, vaporing,
   vaporish, vaporlike, vaporous, vapory