An Assessment of the Effectiveness of an Intervention to Quit Tobacco Use in Patients Seek Treatment from the Institute of Oral Health, Maharagama, Sri Lanka - Amarasinghe, Hemantha; Ananda, WFD; Hariachandra, SKD; Subashani, RADG; Wipularathna, KS; Nadira, ASF; Jayasinghe, Ruwan (Asian Pacific Journal of Cancer Care, 2023)