The war in Iran is choking off Afghanistan’s main economic lifeline and has forced at least 70,000 Afghan workers and students there back home to a nation embroiled in another conflict. Fatima Sajjadi crossed the Iran-Afghanistan border last week after a two-day journey, still coughing from the smoke of burning oil in Tehran. A 26-year-old Afghan graduate student in the southern Iranian city of Bushehr, Ms. Sajjadi initially resiste... [1065 chars]