In Feng Shui, Lungs are associated with the element of metal. 2020 was a metal rat year, and if you remember, we had a disease that affected the lungs.
Metal and lungs are in the West of the Bagua. If you have too much metal in that area, too much metal on your property, or you are metal heavy in your Bazi, or birth chart, you could have lung trouble or be more likely to.
Adding some water can lessen metal’s effect and a bit of fire can help lessen too much metal if it’s an issue for you.