there had been no significant change in smoking prevalence (21.6% in 2006, with, of those who smoked,80% being “persistent smokers” (i.e., those who smoked in both 1992 and 2006)).
there had been no significant change in smoking prevalence(21.6% in 2006, with, of those who smoked,80% being“persistent smokers” (i.e., those who smoked in both 1992and 2006)).