The cotinine level did not decline significantly throughout the survey period in adolescents living with smokers, although a decreasing trend is shown in figure 2 .
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Effectiveness of government anti-smoking policy on non-smoking youth in Korea: a 4-year trend analysis of national survey data.
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The sentences
The smoking rate of adults in 2011 did not show an increasing trend. 13 These results seem to be affected by factors specific to adolescents during this period.