If there were no damage or issues to the item(wear, rough spots, etc.), then I think it could be described as "like new", even with the smoke. The seller probably should have revealed that the item smelled of smoke, but you also could have asked!
I've noticed that many sellers include something like, "from a smoke free home", in their descriptions. Less sellers say something like"this item has been exposed to smoke"! I don't see many if any sellers, saying this items reeks of smoke!
While I agree the smoke odor is disgusting, it at least, can be addressed. As has been said, you can get rid of the smoke odor. Lot's of problems can't be addressed. What do you do about wrong measurements, or numerous moth holes!
If you like the item you bought and think you bought it at a good price, just air the coat out and chalk it up to experience. Ask about smoke prior to your future purchases.
I believe Pkincy contributed to this thread. He once said something that I put into use when on Ebay. When I shop on Ebay(and I do often), I figure that about half the time there will be a problem. And sometimes, I will basically be bilked. I've got to balance that against my chances of getting a real bargain. Ebay does not have(nor should it) the return policy of STP or Yoox, but sometimes you can really get a great deal.
Last week, I bought a Navy Color 100% Cashmere vintage overcoat. It fit me perfectly, and was of extraordinary quality. Cost me $11.00 and $10.00 shipping for a total of $21.00. I was very fortunate and I'm grateful.
It did not smell of smoke at all. If it did, I wouldn't have been happy, but I would have aired it out and after that, I would have enjoyed my bargain.
Short version of all I've said. If you like your purchase and the price, the smoke is just a bump in the road. If you did not, then the smoke only made it worse!
BTW: Minus the smoke were you happy with your purchase?