Figure 1.

Levels of cotinine among non-smoking (i.e., cotinine levels ≤3 ng/mL) pregnant women before (N = 200, mean = 0.78, SD = 0.60) and after (N = 468, mean = 0.52, SD = 0.55) implementation of the 2010 smoking ban. Data are plotted from the exact day (2 January 2010) that the ban was implemented. Results from the regression discontinuity analyses are also displayed. Restricting the data to 500 days before the ban (N = 114) and 500 days after the ban (N = 464), results indicate a significant decline in cotinine values in the days prior to implementation of the smoking ban and a non-significant decline following the ban.