Man even pollutes himself. Take, for example, tobacco and other drug abuse. In the United States, such substance abuse has been termed “the nation’s number one health problem. ”
अमरीका में ऐसे द्रव्य दुष्प्रयोग को “राष्ट्र की सबसे बड़ी स्वास्थ्य समस्या ” कहा गया है ।