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Ridzuan Kunji Koya, J Robert Branston, Allen Gallagher | Tobacco Control | (2024)
Key Takeaways
Sample Definition And Size
The study involved a critical analysis of two independent studies estimating Malaysia's illicit cigarette trade in 2011, 2015, and 2019, conducted by Bui et al. and Koya et al. The exact sample sizes of these original studies are not specified in the provided information.
Study Type
This is a methodological analysis and recalculation study, not an original empirical study. It critically examines and revises previous estimates of Malaysia's illicit cigarette trade by analyzing and correcting methodological discrepancies in two independent studies.
Conflicts Of Interest
The provided information does not disclose any conflicts of interest or potential sources of bias among the authors. However, the study was published in Tobacco Control, a journal that adheres to a strict policy of excluding content funded by the tobacco industry and requiring authors to declare any personal financial ties to the tobacco industry. This policy aims to ensure the integrity and objectivity of the research published in the journal. ([authors.bmj.com](https://authors.bmj.com/policies/tobacco-policy/?utm_source=openai))
Results Summary
The study identified key methodological issues in the original studies: Bui et al.'s assessment of legally imported cigarettes impacting all years; their exclusion of ad valorem duty affecting the 2011 and 2015 estimates; Koya et al.'s oversight of the export market value in their ad valorem calculation and use of the sales value of imported tobacco products, not just cigarettes, impacting estimates for 2011 and 2015. After recalculating using Koya et al.'s consumption data, the study found that in 2019, illicit cigarettes accounted for about 70% of the market, higher than Bui et al.'s estimate of 38% but slightly lower than Koya et al.'s 72%. For 2011 and 2015, where ad valorem applied, the corrected estimates showed illicit cigarette market shares of approximately 41.1% and 52.7%, respectively, differing from Bui et al.'s 0% in 2011 and 29.6% in 2015, and Koya et al.'s 51% in 2011 and 55% in 2015. These findings highlight a substantial illicit cigarette trade problem in Malaysia and underscore the importance of methodological rigor in such estimations.
Abstract
This paper critically analyses contrasting estimates of Malaysia’s illicit cigarette trade in 2011, 2015 and 2019 by Bui et al and Koya et al who previously produced independent estimates at about the same time using tax gap analysis. Collaboration between the two authors’ teams emerged due to the discrepancies in their results, generating this paper to explore the methodological issues identified and hence produce revised estimates of the rate of illicit. Key issues identified were: Bui et al ’s assessment of legally imported cigarettes impacting all years; their exclusion of ad valorem duty affecting the 2011 and 2015 estimates; Koya et al overlooked the value of cigarettes for export market in their ad valorem calculation and used the sales value of imported tobacco/tobacco products, not just cigarettes, both of which impact estimates for 2011 and 2015. Recalculations using Koya et al ’s consumption data reveal that in 2019, illicit cigarettes accounted for about 70% of the market, which is higher than Bui et al ’s estimate (38%) but slightly lower than Koya et al ’s (72%). For 2011 and 2015 where ad valorem applied, the corrected estimates show a share of the illicit cigarette market of approximately 41.1% and 52.7%, respectively, differing from Bui et al ’s 0% in 2011 and 29.6% in 2015, and Koya et al ’s 51% in 2011 and 55% in 2015. This paper provides essential lessons for addressing methodological issues between authors’ teams and updated estimates of Malaysia’s illicit cigarette trade, verifying that Malaysia faces a substantial illicit cigarette trade problem.
Referenced In
RC Yu
7 months ago
Created: Oct 18, 2025