War-weary residents are unfazed by the preelection violence that has swept Afghanistan. 'I've seen so much war,' one says. 'It's my whole life. I don't know anything else. Why would I be afraid now?' Mohammed Yosin was 9 when the Soviet army invaded Afghanistan, not long out of his teens when terrifying rocket duels between rival warlords leveled whole swaths of Kabul, a young man when the Taliban came to power, and breadwinner for his fast-growing family when U.S.-led troops arrived nearly eight years ago.