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Chatbot vs. cigarettes: QuitBot shows promise in helping smokers quit

NCT ID NCT04308759

Disease control Sponsor: Fred Hutchinson Cancer Center 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 a digital chatbot called QuitBot to see if it could help people stop smoking. Over 1,600 adult smokers who wanted to quit were randomly assigned to use QuitBot or another program. The main goal was to see how many people had not smoked for at least 30 days after 12 months.

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

1,647 people

The number who actually took part.

Started

Jul 2022

Finished

Apr 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

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: * Age 18 or older * Smokes at least one cigarette a day for the past 12 months * Wants to quit cigarette smoking within the next 30 days (consistent with text messaging intervention trials) * If concurrently using any other nicotine or tobacco products, wants to quit using them within the next 30 days * Interested in learning skills to quit smoking * Willing to be randomly assigned to either intervention * Resides in United States (US) and will continue to reside in the US for the next 12 months * Has at least daily access to their own smartphone * Has text messaging on their smartphone and knows how to download a smartphone application * Willing and able to read in English, and * Not using other smoking cessation interventions (This eligibility requirement helps ensure results are due to the treatments we recommend rather than those that participants are doing on their own.) Exclusion Criteria: * The reverse of the inclusion criteria

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Conditions

The condition(s) this trial relates to.

Smoking Smoking Cessation Tobacco Use Cessation

As listed by the trial registrant

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

Smoking & tobacco cessation

Contacts and locations

Locations

  • Fred Hutch/University of Washington Cancer Consortium

    Seattle, Washington, 98109, United States

More trials for these conditions

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