Should we let my Dad (91) continue to smoke cigars?

My dad will be 92 next month. He has smoked cigarettes or cigars since he was 17 years old. In the past 2 years he has fallen and broken his hip, had 2 strokes ( the last one has left him unable to use his left hand and leg and is for the most part wheelchair bound) and had pneumonia twice this summer. The first bout with pneumonia landed him in the hospital for a week. He lives with my brother, who has to do everything for him except feed him. We have caregivers come in to help 5 days a week. He has started giving my brother and the care givers so much grief about not letting him smoke. Mentally he is still very sharp. No dementia. Some family members think we should just let him still enjoy his cigar after dinner. My brother and I are trying to follow the doctor's advice of "no more smoking."