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Texting your way to staying smoke-free: hong kong study tests WhatsApp relapse prevention

NCT ID NCT05370352

Prevention 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested whether personalized chat messages via WhatsApp could help people who recently quit smoking stay smoke-free. 590 participants in Hong Kong who had quit for 3 to 30 days received either standard care or additional one-on-one messaging with a trained counselor and a chatbot. The goal was to see if mobile chat support reduces relapse rates.

What this could mean

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

Active substance
personalized chat messaging via WhatsApp
What this could lead to
If it works, this could offer a simple, scalable way to help people stay smoke-free after quitting.
What could go wrong
This is a completed trial, but results are not yet widely confirmed. The effect may depend on the local context and may not apply everywhere.

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

590 people

The number who actually took part.

Started

Mar 2023

Finished

Aug 2025

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

Accepted

You do not need to have the condition being studied to take part.

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 years or above * Own a smartphone with WhatsApp installed * Enrolled in a smoking cessation program under Tung Wah Group of Hospitals Integrated Centre on Smoking Cessation * Smoked daily before the present quit attempt * Abstained from smoking for 3 to 30 days Exclusion Criteria: * Diagnosed with a mental disease or on regular psychotropic drugs * Participating in other ongoing smoking cessation studies

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Conditions

The condition(s) this trial relates to.

Recurrence 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

  • Tung Wah Group of Hospitals Integrated Centre on Smoking Cessation

    Hong Kong, Hong Kong

  • United Christian Nethersole Community Health Service Smoking Cessation Programme

    Hong Kong, Hong Kong

More trials for these conditions

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