I was one of my father's caregivers as he battled with CHF for several years. He was a long-time smoker and things seemed to get better for a bit after he quit, but without detoxing your lungs and cells (as I have learned through naturopathy), there are long term effects. I hope your brother-in-law receives all that he needs as he transitions into his new lifestyle changes and prayers for your sister as she moves into the role of caregiver. A BIG HUG to all of you, Pamela!