I don't blame them. Cigarettes stink and so does everything that comes in contact with the smoke from them. There is another alternative. They could quit smoking. ;o)
They could but the others who are inconvenienced by the smoke smell could move also. It's not like all these people woke up one day after making a smoking rule to discover this couple had also started smoking that same day.
It's also not like they didn't know the construction was crappy and smells and sounds weren't contained when they moved in.