# A Proof-of-concept RCT of Version 3.0 of the Smoking Cessation Smartphone App "Smiling Instead of Smoking" (SiS)

> **NCT04672239** · NA · COMPLETED · sponsor: **Massachusetts General Hospital** · enrollment: 229 (actual)

## Conditions studied

- Nondaily Smoking

## Interventions

- **BEHAVIORAL:** Smartphone app "Smiling instead of Smoking" (SiS) Version 3
- **BEHAVIORAL:** Smartphone app "QuitGuide" (QG)
- **BEHAVIORAL:** Brochure "Clearing the Air" (CTA)

## Key facts

- **NCT ID:** NCT04672239
- **Lead sponsor:** Massachusetts General Hospital
- **Sponsor class:** OTHER
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2021-01-28
- **Primary completion:** 2022-08-10
- **Final completion:** 2023-01-06
- **Target enrollment:** 229 (ACTUAL)
- **Last updated:** 2024-09-19


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04672239

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04672239, "A Proof-of-concept RCT of Version 3.0 of the Smoking Cessation Smartphone App "Smiling Instead of Smoking" (SiS)". Retrieved via AI Analytics 2026-09-16 from https://api.ai-analytics.org/clinical/NCT04672239. Licensed CC0.

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