Gen AI Powered Behavioral Support Plus Chewing Gum Intervention for Construction Workers Who Smoke

The goal of this pilot trial is to learn if 1-week NRT sampling, 3-week chewing gum, and 12-week chatbot-delivered instant messaging support works to help smoking cessation in construction workers who smoke. It will also learn about the feasibility, acceptability, and preliminary effectiveness of delivering the comprehensive intervention in construction settings. The main questions it aims to answer are: 1. Will the integrated intervention, comprising NRT sampling, chewing gum, and chatbot-delivered instant messaging support, show feasibility, acceptability, and appropriateness for delivery in construction worksite settings? 2. Will participants who receive the comprehensive intervention have a higher validated abstinence rate than those who receive NRT sampling alone? Researchers will compare the integrated intervention, comprising NRT sampling, chewing gum, and chatbot-delivered instant messaging support, to the standard care group (NRT sampling alone) to see if the integrated intervention works to promote smoking cessation. Participants in the intervention group will receive: 1. AWARD advice and brief video 2. 1-week NRT sampling 3. 3-week chewing gum 4. 12-week chatbot-based instant messaging support (via WhatsApp)

Inclusion Criteria: 1. Hong Kong residents aged 18 or above 2. Smoke at least one cigarette per day in the preceding 3-month 3. Able to communicate in Cantonese (including reading and writing Chinese) 4. Saliva cotinine 30 ng/ml or above 5. Intent to quit / reduce smoking 6. Have instant messaging tool (WhatsApp) installed 7. Able to use instant messaging tool (e.g., WhatsApp) for communication. Exclusion Criteria: 1. Smokers who are participating in other smoking cessation programmes 2. Smokers who are using any smoking cessation medication 3. Smokers who are presenting with the following oral diseases, including recent oral surgery or tooth extraction, unstable dentures, significant tooth mobility or advanced periodontal disease, temporomandibular pain or dysfunction, or painful oral mucosal lesions