Phanwattana, P. (2017) “The Opinion of Working Age Smoker to Influence Pictorial Warnings on Cigarette Packs”, Thai Journal of Addiction. Patumtani, Thailand, 5(1), pp. 41–56. available at: https://he01.tci-thaijo.org/index.php/pmnidat/article/view/248648 (accessed: 14 September 2026).