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

14 de junio de 2026 actualizado por: 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)

Descripción general del estudio

Estado

Aún no reclutando

Condiciones

Intervención / Tratamiento

Descripción detallada

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.

Tipo de estudio

Intervencionista

Inscripción (Estimado)

200

Fase

  • No aplica

Contactos y Ubicaciones

Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.

Estudio Contacto

  • Nombre: Man Ping Wang, PhD
  • Número de teléfono: +852 3917 6636
  • Correo electrónico: mpwang@hku.hk

Copia de seguridad de contactos de estudio

Ubicaciones de estudio

  • Hong Kong
    • Hong Kong
      • Hong Kong, Hong Kong, Hong Kong, 999077
        • Hong Kong Council on Smoking and Health (COSH)
        • Contacto:
          • Fung Wong
          • Número de teléfono: +852 2180 5186
        • Sub-Investigador:
          • Tai Hing Lam, MD
        • Sub-Investigador:
          • Tzu Tsun Luk, PhD
        • Sub-Investigador:
          • Xiaoyun Xie, MPH
        • Sub-Investigador:
          • Mengyao Li, Mphil
        • Sub-Investigador:
          • Ziqiu Guo, PhD
        • Sub-Investigador:
          • Yilan Wu, Mphil

Criterios de participación

Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.

Criterio de elegibilidad

Edades elegibles para estudiar

  • Adulto
  • Adulto Mayor

Acepta Voluntarios Saludables

No

Descripción

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

Plan de estudios

Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.

¿Cómo está diseñado el estudio?

Detalles de diseño

  • Propósito principal: Investigación de servicios de salud
  • Asignación: Aleatorizado
  • Modelo Intervencionista: Asignación paralela
  • Enmascaramiento: Único

Armas e Intervenciones

Grupo de participantes/brazo
Intervención / Tratamiento
Experimental: Grupo de intervención
Conductual: Folleto de autoayuda para dejar de fumar
Los contenidos incluyen información sobre los beneficios de dejar de fumar, fumar y enfermedades, métodos para dejar de fumar, cómo manejar los síntomas de abstinencia, declaración de abandono, etc.
Conductual: Premio
Los asesoramiento de premios incluyen preguntar sobre el historial de fumar, advertir sobre el alto riesgo, aconsejar que renunciar, remitir a los fumadores a los servicios para dejar de fumar (con una tarjeta de referencia) y hacerlo nuevamente.
Conductual: Tarjeta de referencia
El contenido consiste en información breve y lo más destacado de los servicios de dejar de fumar existentes, métodos de contacto, información de motivación e fuertes mensajes de apoyo o lemas.
Conductual: 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.
Droga: 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.
Conductual: 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.
Conductual: 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.
Conductual: 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.
Comparador activo: Grupo de control
Conductual: Folleto de autoayuda para dejar de fumar
Los contenidos incluyen información sobre los beneficios de dejar de fumar, fumar y enfermedades, métodos para dejar de fumar, cómo manejar los síntomas de abstinencia, declaración de abandono, etc.
Conductual: Premio
Los asesoramiento de premios incluyen preguntar sobre el historial de fumar, advertir sobre el alto riesgo, aconsejar que renunciar, remitir a los fumadores a los servicios para dejar de fumar (con una tarjeta de referencia) y hacerlo nuevamente.
Conductual: Tarjeta de referencia
El contenido consiste en información breve y lo más destacado de los servicios de dejar de fumar existentes, métodos de contacto, información de motivación e fuertes mensajes de apoyo o lemas.
Conductual: 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.
Droga: 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.
Conductual: 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.

¿Qué mide el estudio?

Medidas de resultado primarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Abstinencia validada bioquímicamente
Periodo de tiempo: Seguimiento de 6 meses
Definido como nivel de CO exhalado <4ppm y nivel de cotinina en saliva ≤30 ng/ml
Seguimiento de 6 meses

Medidas de resultado secundarias

Medida de resultado
Medida Descripción
Periodo de tiempo
Abstinencia validada bioquímicamente
Periodo de tiempo: Seguimiento de 3 meses
Definido como nivel de CO exhalado <4ppm y nivel de cotinina en saliva ≤30 ng/ml
Seguimiento de 3 meses
Abstinencia de prevalencia de puntos de 7 días autoinformados
Periodo de tiempo: Seguimientos de 3 y 6 meses
Fumadores que no fumaron ni siquiera una bocanada en los 7 días anteriores al seguimiento
Seguimientos de 3 y 6 meses
Reducción autoinformada
Periodo de tiempo: Seguimientos de 1, 2, 3 y 6 meses
Definido por al menos una reducción del 50% en el número diario de la línea de base de cigarrillos
Seguimientos de 1, 2, 3 y 6 meses
Uso autoinformado del servicio para dejar de fumar
Periodo de tiempo: Seguimientos de 1, 2, 3 y 6 meses
Uso del servicio para dejar de fumar en seguimientos de 1, 2, 3 y 6 meses.
Seguimientos de 1, 2, 3 y 6 meses
Family well-being
Periodo de tiempo: 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
Periodo de tiempo: 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

Otras medidas de resultado

Medida de resultado
Medida Descripción
Periodo de tiempo
Recruitment rate
Periodo de tiempo: Baseline
Defined as the number of participants divided by the number of eligible smokers
Baseline
Retention rate
Periodo de tiempo: 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
Periodo de tiempo: 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
Periodo de tiempo: 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
Periodo de tiempo: 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
Periodo de tiempo: 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

Colaboradores e Investigadores

Aquí es donde encontrará personas y organizaciones involucradas en este estudio.

Patrocinador

The University of Hong Kong

Investigadores

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

Fechas de registro del estudio

Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados ​​por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.

Fechas importantes del estudio

Inicio del estudio (Estimado)

20 de junio de 2026

Finalización primaria (Estimado)

31 de mayo de 2027

Finalización del estudio (Estimado)

30 de junio de 2027

Fechas de registro del estudio

Enviado por primera vez

9 de junio de 2026

Primero enviado que cumplió con los criterios de control de calidad

9 de junio de 2026

Publicado por primera vez (Actual)

15 de junio de 2026

Actualizaciones de registros de estudio

Última actualización publicada (Actual)

17 de junio de 2026

Última actualización enviada que cumplió con los criterios de control de calidad

14 de junio de 2026

Última verificación

1 de junio de 2026

Más información

Términos relacionados con este estudio

Palabras clave

Términos MeSH relevantes adicionales

Otros números de identificación del estudio

  • Build to Quit

Plan de datos de participantes individuales (IPD)

¿Planea compartir datos de participantes individuales (IPD)?

NO

Información sobre medicamentos y dispositivos, documentos del estudio

Estudia un producto farmacéutico regulado por la FDA de EE. UU.

No

Estudia un producto de dispositivo regulado por la FDA de EE. UU.

No

Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .

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