Smoking Is often associated with lung problems, but its impact on the heart can be just as serious. Tobacco smoke contains toxic substances that can affect {blood vessels|arteries|, blood pressure, oxygen levels, and the way blood clots. The worrying part is that these changes may begin quietly, even when you https://www.diigo.com/item/note/b2kvl/q4w3?k=e3e251da3534cee73b098559a46fe648