Emphysema Causes. Cigarette smoking is by far the most dangerous behavior that causes people to develop emphysema, and it is also the most preventable cause. Other risk factors include a deficiency of an enzyme called alpha-1-antitrypsin, air pollution, airway reactivity, heredity, male sex, and age. The importance of cigarette smoking as a risk factor for developing emphysema cannot be overemphasized. Cigarette smoke contributes to this disease process in two ways.
Northern Virginia map - Virginia county, city, map with roads. Arlington County, Alexandria City. Arlington and the city of Alexandria Virginia are close to Washington DC, inside the beltway.
The source of the North Branch Potomac River is at the Fairfax Stone located at the junction of Grant, Tucker and Preston counties in West Virginia. From the Fairfax Stone, the North Branch Potomac River flows to the man-made Jennings Randolph Lake, an impoundment designed for flood control.he South Fork South Branch Potomac River forms just north of U.S. Route 250 in Highland County, Virginia near Head Waters and flows 55 miles (89 km) north-northeastward to the South Branch Potomac River at Moorefield in Hardy County, West Virginia.