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. 2015 Nov 18;15:1143. doi: 10.1186/s12889-015-2457-z

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© Hansen et al. 2015

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Current smoking status among second grade high school students by age of smoking initiation. Distribution of current smoking status related to early or later smoking initiation among second grade high school boys and girls