Verachai, V. (2015) “The Pilot study of Effectiveness of Vernonia Cinerea (L) Less for 4 weeks in smoking cessation”, Thai Journal of Addiction. Patumtani, Thailand, 3(1-2), pp. 1–16. available at: https://he01.tci-thaijo.org/index.php/pmnidat/article/view/248707 (accessed: 14 September 2026).