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. 2024 Feb 16;24:132. doi: 10.1186/s12888-024-05561-1

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© The Author(s) 2024

Open Access This 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 — Geographic distribution of substance use in 22 districts of Tehran based on the first three digits of the residential zip codes. Suburban areas, particularly southern districts, are recognized for being prominent routes for drug trade and experiencing elevated levels of drug trafficking. More information about the details of the Tehran population and the distribution of participants from each district were indicated in our protocol [26]