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Does the clock matter? scientists randomize when Quit-Smoking chatbots ping you

NCT ID NCT07826884

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 This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 17, 2026 · Last updated Sep 18, 2026 · Updated 1 time

Summary

Researchers at the University of Hong Kong are studying whether the timing of weekly chatbot reminders changes how people engage with a digital smoking cessation service. About 350 Cantonese-speaking adults who used tobacco in the past 30 days will receive routine chatbot support for 12 weeks through WhatsApp. Each week, the system randomly assigns when the reminder is sent, varying by day type and time of day. The team then checks system records to see whether participants reply and how quickly they re-engage.

What this could mean

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

Active substance
a chatbot smoking cessation service with randomly timed weekly reminders
What this could lead to
If timing matters, this could help designers build digital quit-smoking tools that keep people engaged long enough to benefit.
What could go wrong
This is a small behavioral study of engagement, not quit rates. Better engagement with a chatbot may not translate into more people actually quitting smoking.

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

About 350 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Sep 2026

An estimate. Start dates often move.

Expected to finish

Dec 2027

An estimate. End dates often move.

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

Children (under 18), adults (18 to 64) and older adults (65 and over)

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: * Able to communicate in Chinese (Cantonese) * Have access to or are willing to use WhatsApp to access the chatbot cessation service * Used any tobacco in the past 30 days (including all types of tobacco products such as cigarette, shisha, electronic cigarettes, and heat-not-burn (HNB)) Exclusion Criteria: * Have communication difficulties (either physical or cognitive) that prevent completion of the counselling and assessments * Having queries irrelevant to tobacco control

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Conditions

The condition(s) this trial relates to.

Smoking Cessation

As listed by the trial registrant

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

Smoking cessation

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • School of Nursing, The University of Hong Kong

    Hong Kong, Hong Kong

More trials for these conditions

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