Just-in-Time Support for Smoking, Vaping, and Eating Urges During High-Stress Moments Among Gender and Sexual Minority Adults in Dhaka

Summary

Gender and sexual minority adults in Bangladesh experience high levels of stigma-related stress. Acute stress can trigger strong, affect-driven urges to smoke, vape, or engage in stress-attributed eating. These urges can rise and fall within minutes to hours, operating outside the reach of conventional clinic-based interventions delivered days or weeks later.

This pilot micro-randomized trial (MRT) evaluates whether delivering a brief, culturally adapted support message via smartphone during moments of high self-reported stress reduces the intensity of the urge for the participant's pre-specified target behaviour, relative to no message. Over a 24-day period, 115 participants will be scheduled for up to 5 ecological momentary assessments (EMA) per day. Whenever a participant reports an acute stress level of 5 or higher (0 to 10 scale) and satisfies pre-specified privacy, safety, behavioural, and spacing criteria, the app randomizes with probability 0.5 to deliver either a brief support message or no message. By contributing multiple randomized decision points over time, each participant serves as their own micro-control.

The primary outcome is the intensity of the urge for the participant's pre-specified target behaviour, measured 45 to 60 minutes after randomization. An exploratory urge assessment is also collected 10 minutes after randomization; comparing the two time points will help establish whether the support message's effect is immediate, delayed, or both, and will inform the choice of follow-up window for a future, fully powered trial. Prior to trial launch, all EMA items, message content, notification logic, and digital safety protocols will be developed and tested with community members, reviewed by a Community Advisory Board, and locked.

As a pilot optimization trial, its objectives are to estimate the short-term causal effect of the prompt, to identify the contexts in which that effect is larger or smaller, and to establish whether momentary assessment and just-in-time intervention research can be delivered safely, privately, and acceptably in this high-stigma setting. The study does not evaluate long-term behavioural maintenance and does not claim to address the underlying structural stigma and discrimination that produce minority stress.

Conditions

• Tobacco Use
• Electronic Cigarette Use
• Emotional Eating
• Stress, Psychological

Interventions

BEHAVIORAL

Just-in-Time Adaptive Support Message

A brief, culturally adapted, in-app behavioral support message delivered on the participant's own smartphone immediately after randomization at an eligible high-stress decision point. Content is finalized and locked before the trial following a formative cultural adaptation phase and review by a Community Advisory Board. The message is matched to the participant's locked target behavior and may include grounding, urge-delay, motivational, values-based, environmental, substitute-action, social-support, or location-change strategies. It is nonjudgmental, action-oriented, designed to be read in under one minute, and requires no immediate response. At decision points randomized to the no-message option, no immediate support message is delivered.

Sponsors & Collaborators

• Global Affairs Canada

  collaborator OTHER

• International Centre for Diarrhoeal Disease Research, Bangladesh

  lead OTHER

Principal Investigators

• Pritom K. Das · International Centre for Diarrhoeal Disease Research, Bangladesh

Study Design

Allocation

NA

Purpose

TREATMENT

Masking

NONE

Model

SINGLE_GROUP

Eligibility

Min Age

18 Years

Sex

ALL

Healthy Volunteers

No

Timeline & Regulatory

Start

2026-09-01

Primary Completion

2027-01-30

Completion

2027-02-06

Countries

• Bangladesh

Study Locations