I wish to know if when somebody have a terminal or chronic disease if that person is possessed by an evil spirit
Is possible make a person recover their good health removing the bad spirit of their body?
Yes, it is possible, but not always. Diseases are living things themselves and thus have their own spirit. Interacting with and banishing that spirit is what shamans have traditionally done, I believe.
Sage smoke kills those pathogens so smudging is a good practice to keep.
I think so, if the spirit is what’s causing it. The human body wants to heal and is very good at it. If you can remove what’s in it’s way, it will be able to heal faster than it deteriorates. Things in a body’s way include diet and exposure to environmental/metal/emotional toxins as well as occult factors like parasitic entities, soul fragmentation or possession.