Changes in retail cigarette price after tax increase: Findings from the 2018-2020 ITC Vietnam surveys

Tob Induc Dis. 2024 Dec 17:22. doi: 10.18332/tid/196675. eCollection 2024.

Abstract

Introduction: No longitudinal study has investigated the impact of cigarette tax increases on retail prices in Vietnam. This study aims to describe changes in the purchase price of cigarettes following an excise tax increase from 70% to 75% in January 2019.

Methods: Data were collected from people who currently smoke cigarettes in the longitudinal ITC Vietnam surveys: 1870 participants in Wave 1 (pre-increase), 1564 in Wave 2 (post-increase), and 1308 in Wave 3 (post-increase). Weighted mean self-reported prices of a cigarette pack (with standard error) were calculated for participants who were successfully followed up across three waves. These mean prices were calculated for domestic and international brands, categorized by specific cigarette brands. Percentage changes in mean prices were also measured, and significant differences in mean prices between follow-up waves (Waves 2 and 3) and the baseline (Wave 1) were assessed using paired t-tests. For brands with very small sample sizes, we used non-parametric tests, specifically the Wilcoxon signed-rank test instead of paired t-tests.

Results: The weighted mean price of a cigarette pack remained low and stable: VND 12330 (US$0.54) in 2018, VND 12700 (US$0.55) in 2019, and VND 12120 (US$0.53) in 2020 (1000 Vietnamese Dongs about US$0.04345, at 2018). International brands were substantially more expensive than domestic brands, but prices for both remained constant across all waves. Among domestic brands, Thang Long and Sai Gon showed slight price increases of around 3% and 5%, respectively (p<0.05). Among international brands, no statistically significant increase in mean prices was observed.

Conclusions: The retail price of cigarettes remains low, indicating that the slight tax increase was insufficient to raise the current retail price significantly. Therefore, a substantial increase in cigarette prices by adding a specific tax is necessary.

Keywords: Vietnam; cigarette price; cigarette tax; longitudinal study; low- and middle-income country.

Grants and funding

FUNDING The ITC Vietnam Wave 1 survey was supported by grants from Vietnam Tobacco Control Fund, Ministry of Health (54/2018/HĐ-QPCTHTL-ĐHYTCC), and The Union (RR-01). The ITC Vietnam Wave 2 survey was supported by grants from The Union (VN-2502). The ITC Vietnam Wave 3 survey was supported by grants from Vietnam Tobacco Control Fund, Ministry of Health (39/2020/HĐ-QPCTHTL-ĐHYTCC). All surveys were supported by the Canadian Institutes of Health Research (FDN-148477). Financial support for the postdoctoral fellowship in Global Tobacco Research and publication fees were provided by the Bloomberg Initiative to Reduce Tobacco Use through the CDC Foundation with a grant from Bloomberg Philanthropies. The findings and conclusions in this study are those of the authors and do not necessarily represent the official position of the CDC Foundation.