Yingyongsaksri, S., Jueaprasert, K., Thiboonmee, J. and Chuaisri, P. 2022. C18. Correlation between Perceived Severity of COVID-19 and Self-Protective Behavior during COVID-19 Pandemic in Chiang Rai Smokers . Journal of Health Science and Alternative Medicine. (Jul. 2022), 156–162.