I have been running smoking sessation programs based on the recommendations by the American Lung Association.
As part of this process, I may have suggested a walk as one of the possible delay tactics but I really did not talk about exercise as another item. If they were already exercising, I applauded and further encouraged it. If they did not, I just did not go there.
People who try to stop smoking already have their hands full, and I did not include it as part of the program.