Across the years from 1998 the proportion of children aged
less than 16 whose parents (one or both) reported being
current cigarette smokers declined steadily and substantially,
from 41% in 1998 to 27.8% in 2012 (Table 1, left).
A closely similar reduction in reported parental smoking
was observed in the subsample of confirmed non-smoking
children aged 4–15, and overall geometric mean cotinine