Optimizing when weekly chatbot reminders go out to people using a chatbot for quitting smoking

Is this trial a fit for you?

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This embedded micro-randomized trial runs within an existing chatbot cessation program. Over 12 weeks, the timing of 11 weekly reminders is randomized across predefined day types and times to see how it affects short-term engagement. The main measure is whether users interact with the chatbot within 24 hours after a reminder, with secondary outcomes including whether they reply and how quickly they re-engage. The trial uses routine system data and does not add new interventions beyond reminder timing. Participation is opt-out and limited to users already enrolled in the service.

Why it matters

Who can join: the full rules

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

Where it's running

• School of Nursing, The University of Hong Kong
  Hong Kong, Hong Kong Recruiting

Study contacts

• Study coordinator: Man Ping Wang
• Email: mpwang@hku.hk
• Phone: +852 3917 6636

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How to take part

1. Review the eligibility criteria above with your treating physician.
2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.