We have a cat in the house but we don’t smoke in the house. We have always went outside to smoke.
I have read somewhere that the smoke will actually adhear to the pet’s coat and then will be licked off as the animal grooms itself and ingested. I don’t know if that is true but it does make sense.
Even though I smoke I do believe that second hand smoke does cause problems for those people and animals that are in contact with it.