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. 2023 Mar 7;13:47. doi: 10.1186/s13578-023-00998-5

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© The Author(s) 2023

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 3 — Unweighted analysis of the relationship between age and gender-related differences in the annual decline in lung function (FEV₁%) pred/year according to smoking. The squares/dotted line represents never smokers, the triangles/dashed line represents former smokers, and the diamonds/solid line represents current smokers. Recreated with permission from BioMed Central publisher and was first published by Gan et al. [64]