I think this is a very positive thing, but is it because employers want healthier, happier, and more productive workers or is it because it affects cost? And if successful, will they share their profits with the workers who helped make them?

Some have tried everything and maybe coping with work stress is not helpful. If the employers help then the worker will feel more relaxed about making another effort to give up.
There are not many smokers who haven't tried to give up at some time.