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

14 juni 2026 bijgewerkt door: Prof. Wang Man-Ping, The University of Hong Kong

Build to Quit 「築建無煙」: Gen AI Powered Behavioral Support Plus Chewing Gum Intervention for Construction Workers Who Smoke: A Pragmatic, Pilot, Cluster Randomized Controlled Trial

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)

Studie Overzicht

Toestand

Nog niet aan het werven

Conditie

Interventie / Behandeling

Gedetailleerde beschrijving

Hong Kong has achieved a sustained reduction in daily cigarette smoking, from 23.3% in the early 1980s to 8.5% in 2025. However, the current prevalence remains above the Government's Towards 2025 target of 7.8%, indicating the need for continued and targeted cessation efforts. The construction industry represents a particularly important setting for intervention, as recent legislative amendments to designate construction sites as no-smoking areas have further strengthened the policy basis for promoting smoke-free worksites.

Construction workers (CWs) are a high-priority population for smoking cessation because they have consistently higher smoking prevalence than many other occupational groups and the general population. In Hong Kong, a workplace health study found that 45% of construction workers were daily smokers, nearly twice the prevalence among office clerks/professionals. For CWs, smoking may compound existing occupational health risks by increasing susceptibility to respiratory and cardiovascular diseases in a physically demanding and dust-exposed work environment.

This study proposes a comprehensive worksite-targeted smoking cessation intervention model for CWs who smoke in Hong Kong, integrating NRT sampling, chewing gum support, and chatbot-delivered instant messaging. NRT is an evidence-based pharmacotherapy for reducing nicotine withdrawal symptoms and supporting smoking abstinence, and has been widely used in community-based cessation interventions. For CWs, short-term NRT sampling may provide immediate access to evidence-based pharmacological support, reduce early withdrawal symptoms, and lower the initial barrier to treatment uptake in a worksite setting. Chewing gum may complement NRT sampling by serving as a low-cost behavioral substitute for smoking, particularly by replacing the hand-to-mouth and oral routines associated with cigarette use. Chatbot-delivered instant messaging support can further extend the intervention beyond the worksite by providing 24/7 support, reminders for NRT and chewing gum use, and real-time assistance during cravings or high-risk smoking situations.

Studietype

Ingrijpend

Inschrijving (Geschat)

200

Fase

  • Niet toepasbaar

Contacten en locaties

In dit gedeelte vindt u de contactgegevens van degenen die het onderzoek uitvoeren en informatie over waar dit onderzoek wordt uitgevoerd.

Studiecontact

  • Naam: Man Ping Wang, PhD
  • Telefoonnummer: +852 3917 6636
  • E-mail: mpwang@hku.hk

Studie Contact Back-up

Studie Locaties

  • Hongkong
    • Hong Kong
      • Hong Kong, Hong Kong, Hongkong, 999077
        • Hong Kong Council on Smoking and Health (COSH)
        • Contact:
          • Fung Wong
          • Telefoonnummer: +852 2180 5186
        • Onderonderzoeker:
          • Tai Hing Lam, MD
        • Onderonderzoeker:
          • Tzu Tsun Luk, PhD
        • Onderonderzoeker:
          • Xiaoyun Xie, MPH
        • Onderonderzoeker:
          • Mengyao Li, Mphil
        • Onderonderzoeker:
          • Ziqiu Guo, PhD
        • Onderonderzoeker:
          • Yilan Wu, Mphil

Deelname Criteria

Onderzoekers zoeken naar mensen die aan een bepaalde beschrijving voldoen, de zogenaamde geschiktheidscriteria. Enkele voorbeelden van deze criteria zijn iemands algemene gezondheidstoestand of eerdere behandelingen.

Geschiktheidscriteria

Leeftijden die in aanmerking komen voor studie

  • Volwassen
  • Oudere volwassene

Accepteert gezonde vrijwilligers

Nee

Beschrijving

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

Studie plan

Dit gedeelte bevat details van het studieplan, inclusief hoe de studie is opgezet en wat de studie meet.

Hoe is de studie opgezet?

Ontwerpdetails

  • Primair doel: Onderzoek naar gezondheidsdiensten
  • Toewijzing: Gerandomiseerd
  • Interventioneel model: Parallelle opdracht
  • Masker: Enkel

Wapens en interventies

Deelnemersgroep / Arm
Interventie / Behandeling
Experimenteel: Interventie groep
Gedragsmatig: Zelfhulpboekje stoppen met roken
De inhoud omvat informatie over de voordelen van stoppen, roken en ziektes, methoden om te stoppen, hoe om te gaan met ontwenningsverschijnselen, verklaring van stoppen, enz.
Gedragsmatig: Advies
Award -advies omvatten vraag over de rookgeschiedenis, waarschuw voor het hoge risico, adviseren om te stoppen, verwijzen rokers naar het stoppen met roken (met een verwijzingskaart) en doe dit opnieuw.
Gedragsmatig: Verwijzingskaart
De inhoud bestaat uit korte informatie en een hoogtepunt van bestaande stopzettingsdiensten, contactmethoden, motivatie -informatie en sterke ondersteunende berichten of slogans.
Gedragsmatig: Brief leaflet on health warning and smoking cessation
The contents of the leaflet include (1) highlights of the absolute risk of death due to smoking; (2) the whole list of diseases caused by active and secondhand smoking; (3) ten horrible pictorial warnings of health consequences of smoking and second-hand smoking in one page to maximize the impacts; (4) benefits of SC and (5) simple messages to encourage participants to quit smoking.
Geneesmiddel: 1-week nicotine gum
Participants in both group will receive a 1-week supply of free nicotine gum (2 mg or 4 mg). The dosage of nicotine gum will be guided by participants' daily cigarette consumption, in accordance with recommendations from the Department of Health. Research assistants will explain the benefits of NRT for smoking cessation, provide instructions on the correct use of nicotine gum, encourage participants to continue using nicotine gum after completing the free sample where appropriate, and advise participants to reduce smoking or make a quit attempt when using NRT.
Gedragsmatig: 3-week chewing gum
Participants in the intervention group will receive 6 packs of chewing gum at baseline (2 packs per week). Chewing gum will be presented as a practical strategy to replace the hand-to-mouth and oral routines associated with smoking, particularly during work breaks, after meals, in other smoking-related situations at construction sites, or when participants are unwilling to use nicotine gum.
Gedragsmatig: 12-week chatbot-based instant messaging support
Participants in the intervention group will receive 12 weeks of instant messaging support delivered by the LLM-based chatbot accessible via WhatsApp platform. The chatbot, powered by Claude model (or more advanced model available) using prompt-engineering and agent-based techniques, will deliver theory-based and structured intervention alongside freeform, on-demand support. The structured intervention session deploys the 5As model (Ask, Advise, Assess, Assist, and Arrange follow-up) and 5Rs model (Relevance, Risks, Rewards, Roadblocks, Repetition), as used in our previous telephone-counselling trials and recommended by WHO for brief SC intervention.
Gedragsmatig: Brief video
Participants in both groups will receive a brief motivational video (15-second) via WhatsApp. The video will feature a construction worker who successfully quit smoking in our previous trial, providing a relatable peer role model for participants. The video will welcome participants to the programme, encourage them to make a quit attempt, and promote early use of nicotine gum as a practical strategy for managing cravings and supporting smoking cessation.
Actieve vergelijker: Controlegroep
Gedragsmatig: Zelfhulpboekje stoppen met roken
De inhoud omvat informatie over de voordelen van stoppen, roken en ziektes, methoden om te stoppen, hoe om te gaan met ontwenningsverschijnselen, verklaring van stoppen, enz.
Gedragsmatig: Advies
Award -advies omvatten vraag over de rookgeschiedenis, waarschuw voor het hoge risico, adviseren om te stoppen, verwijzen rokers naar het stoppen met roken (met een verwijzingskaart) en doe dit opnieuw.
Gedragsmatig: Verwijzingskaart
De inhoud bestaat uit korte informatie en een hoogtepunt van bestaande stopzettingsdiensten, contactmethoden, motivatie -informatie en sterke ondersteunende berichten of slogans.
Gedragsmatig: Brief leaflet on health warning and smoking cessation
The contents of the leaflet include (1) highlights of the absolute risk of death due to smoking; (2) the whole list of diseases caused by active and secondhand smoking; (3) ten horrible pictorial warnings of health consequences of smoking and second-hand smoking in one page to maximize the impacts; (4) benefits of SC and (5) simple messages to encourage participants to quit smoking.
Geneesmiddel: 1-week nicotine gum
Participants in both group will receive a 1-week supply of free nicotine gum (2 mg or 4 mg). The dosage of nicotine gum will be guided by participants' daily cigarette consumption, in accordance with recommendations from the Department of Health. Research assistants will explain the benefits of NRT for smoking cessation, provide instructions on the correct use of nicotine gum, encourage participants to continue using nicotine gum after completing the free sample where appropriate, and advise participants to reduce smoking or make a quit attempt when using NRT.
Gedragsmatig: Brief video
Participants in both groups will receive a brief motivational video (15-second) via WhatsApp. The video will feature a construction worker who successfully quit smoking in our previous trial, providing a relatable peer role model for participants. The video will welcome participants to the programme, encourage them to make a quit attempt, and promote early use of nicotine gum as a practical strategy for managing cravings and supporting smoking cessation.

Wat meet het onderzoek?

Primaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Biochemisch gevalideerde onthouding
Tijdsspanne: 6 maanden follow-up
Gedefinieerd als uitgeademd CO-gehalte <4ppm en speeksel-cotininegehalte ≤30 ng/ml
6 maanden follow-up

Secundaire uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Biochemisch gevalideerde onthouding
Tijdsspanne: 3 maanden follow-up
Gedefinieerd als uitgeademd CO-gehalte <4ppm en speeksel-cotininegehalte ≤30 ng/ml
3 maanden follow-up
Zelf gerapporteerde 7-daagse prevalentie onthouding
Tijdsspanne: 3- en 6-maanden follow-ups
Rokers die zelfs geen trek rookten in de 7 dagen voorafgaand aan de follow-up
3- en 6-maanden follow-ups
Zelfgerapporteerde reductie
Tijdsspanne: 1-, 2-, 3- en 6-maanden follow-ups
Gedefinieerd door ten minste 50% vermindering van het dagelijkse dagelijkse aantal sigaretten
1-, 2-, 3- en 6-maanden follow-ups
Zelfgerapporteerd gebruik van het stoppen met roken
Tijdsspanne: 1-, 2-, 3- en 6-maanden follow-ups
Gebruik van het stoppen met roken bij follow-ups van 1-, 2-, 3- en 6 maanden.
1-, 2-, 3- en 6-maanden follow-ups
Family well-being
Tijdsspanne: 3- and 6-month follow-ups
Family well-being will be assessed using the 3H scale, which measures perceived family health, happiness, and harmony on a 0-10 scale.
3- and 6-month follow-ups
Perceived family happiness
Tijdsspanne: 3- and 6-month follow-ups
Perceived family happiness will be measured using a single-item self-reported family happiness scale ranging from 0 to 10.
3- and 6-month follow-ups

Andere uitkomstmaten

Uitkomstmaat
Maatregel Beschrijving
Tijdsspanne
Recruitment rate
Tijdsspanne: Baseline
Defined as the number of participants divided by the number of eligible smokers
Baseline
Retention rate
Tijdsspanne: 1-, 2-, 3- and 6-month follow-ups
Defined as the number of participants who completed the follow-up divided by the number of participants
1-, 2-, 3- and 6-month follow-ups
Acceptability of NRT sampling
Tijdsspanne: 1-, 2-, 3- and 6-month follow-ups
Acceptability of NRT sampling will be assessed through 4 brief items (score range from 0 to10) on perceived usefulness for craving relief, perceived side effects, willingness to continue using NRT after the free sample, and overall satisfaction with the NRT gum.
1-, 2-, 3- and 6-month follow-ups
Acceptability of chewing gum
Tijdsspanne: 1-, 2-, 3- and 6-month follow-ups
Acceptability of chewing gum will be assessed through 3 brief items (score range from 0 to 10) on perceived usefulness for behavioral substitution, perceived fit with construction worksite routines, and willingness to continue using chewing gum as a cessation aid.
1-, 2-, 3- and 6-month follow-ups
Self-reported adverse events
Tijdsspanne: 1-, 2-, 3- and 6-month follow-ups
Self-reported adverse events related to nicotine gum and chewing gum will be assessed using a binary question: "Have you experienced any adverse events when using nicotine gum or chewing gum?"
1-, 2-, 3- and 6-month follow-ups
Chatbot usability
Tijdsspanne: 3-month follow-up
Chatbot usability will be evaluated using the 11-item Bot Usability Scale (BUS), which assesses perceived effectiveness, efficiency, and satisfaction. The score of the Bot Usability Scale ranges from 0 to 100, with the higher score indicating more usability of the chatbot.
3-month follow-up

Medewerkers en onderzoekers

Hier vindt u mensen en organisaties die betrokken zijn bij dit onderzoek.

Sponsor

The University of Hong Kong

Onderzoekers

  • Hoofdonderzoeker: Man Ping Wang, PhD, The University of Hong Kong

Studie record data

Deze datums volgen de voortgang van het onderzoeksdossier en de samenvatting van de ingediende resultaten bij ClinicalTrials.gov. Studieverslagen en gerapporteerde resultaten worden beoordeeld door de National Library of Medicine (NLM) om er zeker van te zijn dat ze voldoen aan specifieke kwaliteitscontrolenormen voordat ze op de openbare website worden geplaatst.

Bestudeer belangrijke data

Studie start (Geschat)

20 juni 2026

Primaire voltooiing (Geschat)

31 mei 2027

Studie voltooiing (Geschat)

30 juni 2027

Studieregistratiedata

Eerst ingediend

9 juni 2026

Eerst ingediend dat voldeed aan de QC-criteria

9 juni 2026

Eerst geplaatst (Werkelijk)

15 juni 2026

Updates van studierecords

Laatste update geplaatst (Werkelijk)

17 juni 2026

Laatste update ingediend die voldeed aan QC-criteria

14 juni 2026

Laatst geverifieerd

1 juni 2026

Meer informatie

Termen gerelateerd aan deze studie

Trefwoorden

Aanvullende relevante MeSH-voorwaarden

Andere studie-ID-nummers

  • Build to Quit

Plan Individuele Deelnemersgegevens (IPD)

Bent u van plan om gegevens van individuele deelnemers (IPD) te delen?

NEE

Informatie over medicijnen en apparaten, studiedocumenten

Bestudeert een door de Amerikaanse FDA gereguleerd geneesmiddel

Nee

Bestudeert een door de Amerikaanse FDA gereguleerd apparaatproduct

Nee

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