Chronic Cough Problems?

My mother has a chronic cough that sometimes gives her shortness of breath. This happened largely because she was exposed to second-hand smoke for most of her life. And I was just wondering if ginseng is good for the lungs so that she can breathe better. Also, she has high blood pressure as well due to stress. Is it still safe for her to use ginseng for her chronic cough even though she has high blood pressure? Thanks