About 24.7 percent of American adults had smoked 100 or more cigarettes in 1995, according to statistics released this week by the Centers for Disease Control and Prevention. In round numbers, there were nearly as many people smoking in 1995 (47 million adults) as people who'd quit (44.3 million). Smoking was most common among Indian and Alaska native men (37.3 percent), and least common among women of Asian or Pacific Islander ethnicity (4.3 percent). Smoking was most prevalent, at 37.5 percent, among people with nine to 11 years of education; among people with eight or fewer years of schooling, smoking was much less common at 22.6 percent. Smoking was more common (32.5 percent) among people living below the federal poverty line.