Developing a Community Support Program to Help People Quit Smoking.

Brief Summary What is the purpose of this research? The goal of this study is to test a new method to help informal workers in Thailand quit smoking. The investigators seek to determine if a community-based system using digital tools (such as the Line app) is more effective than the standard care provided by local health centers. How will the research happen? The investigators will divide participants into two groups: Intervention Group: This group will receive a new support system. Trained village health volunteers (VHVs) will offer brief advice and support. Participants will also receive messages and counseling through the Line application and a telephone "Quitline" (1600). Comparison Group: This group will receive the standard care normally provided at local health centers. The study takes place in Saraburi, Thailand, and lasts for approximately 3 months. Who can take part? The study team is seeking individuals who: Are between 18 and 60 years old. Work in jobs without formal contracts (informal workers), such as street vendors or farmers. Currently smoke cigarettes. Own a smartphone with internet access. What are the research questions? The investigators will measure four primary outcomes after 3 months to evaluate the effectiveness of the new system: The number of smokers who received sufficient information to decide to quit. The number of participants who intend to quit smoking. The number of participants who successfully quit smoking (confirmed by a breath test). The cost and value of the program compared to the health benefits gained.

Inclusion Criteria: * Informal worker, defined as an individual engaged in an occupation outside the formal employment system, typically lacking social security benefits or formal employment contracts (e.g., street vendors, agricultural laborers, motorcycle taxi drivers, freelancers). * Current smoker, defined as an individual who has smoked at least one cigarette daily or non-daily within the past 30 days. * Residing in the study area (Mueang Saraburi District) for at least 3 months prior to enrollment. * Owns a smartphone with reliable internet access and is proficient in using mobile applications (specifically the Line Application). * Able to speak, read, and communicate clearly in Thai. * Willing and able to provide written informed consent to participate in the full duration of the 6-month study. Exclusion Criteria: * Individuals currently participating in other smoking cessation programs or concurrent clinical research studies. * Individuals with physical or mental health conditions that may impair their ability to provide accurate information or consistently participate in digital follow-up (e.g., severe cognitive impairment, advanced terminal illness). * Planning to relocate outside the designated study area within the next 6 months.