[Study of twin-birth on genetic or environmental determinants of male Chinese smoking initiation].

OBJECTIVE To determine the role of genetic and environmental factors in the onset of smoking in Chinese male twins. METHODS Retrospective data on initiation and age at onset of smoking, reported by 1,006 adult twin pairs [aged 18 year-old or more, 638 pairs of monozygotic (MZ) twins and 368 pairs of dizygotic (DZ) twins] were analyzed to calculate the… CONTINUE READING