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AI chatbot takes on smoking: could WhatsApp help you quit?

NCT ID NCT06914492

Symptom relief Sponsor: The University of Hong Kong Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 26, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tested whether a chatbot providing instant messaging support via WhatsApp could help adult smokers in Hong Kong quit. Over 1,000 participants received either brief advice plus chatbot support or brief advice alone. The goal was to see if the chatbot led to higher quit rates, measured by breath and saliva tests.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
chatbot-based instant messaging support (via WhatsApp)
What this could lead to
If it works, this could provide a scalable, low-cost tool to help smokers quit using AI-powered chat support.
What could go wrong
This is a completed trial with results not yet reported. The chatbot may not outperform brief advice alone, and participants must already use WhatsApp, limiting generalizability.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

1,058 people

The number who actually took part.

Started

Jun 2025

Finished

Jun 2026

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Hong Kong residents aged 18 or above * Smoke at least 1 tobacco stick (includes HTP) per day or use e-cigarette daily in the past 3-month * Able to communicate in Chinese * Exhaled carbon monoxide level ≥4 part per million or a positive salivary cotinine test * Intention to quit/reducing smoking * Have instant messaging tool (WhatsApp) installed * Able to use the instant messaging tool (e.g., WhatsApp) for communication Exclusion Criteria: * Smokers who have communication barriers (either physical or cognitive). * Smokers who are currently participating in other smoking cessation programs or services.

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Conditions

The condition(s) this trial relates to.

nicotine dependence Smoking Cessation

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Smoking cessation

Contacts and locations

Locations

  • Hong Kong Council on Smoking and Health (COSH)

    Hong Kong, Hong Kong, 999077, Hong Kong

More trials for these conditions

Other studies related to the condition(s) this trial covers.