# Reactions to Warnings on Hookah Ads

> **NCT03723616** · NA · COMPLETED · sponsor: **Duke University** · enrollment: 2588 (actual)

## Conditions studied

- Reactions to Warnings
- Hookah Smoking

## Interventions

- **BEHAVIORAL:** Ads Only
- **BEHAVIORAL:** Ads with text-only health warning labels (HWLs)
- **BEHAVIORAL:** Ads with text + graphic health warning labels (HWLs)

## Key facts

- **NCT ID:** NCT03723616
- **Lead sponsor:** Duke University
- **Sponsor class:** OTHER
- **Phase:** NA
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2018-10-05
- **Primary completion:** 2021-03-26
- **Final completion:** 2021-03-26
- **Target enrollment:** 2588 (ACTUAL)
- **Last updated:** 2025-12-18


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT03723616

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT03723616, "Reactions to Warnings on Hookah Ads". Retrieved via AI Analytics 2026-07-13 from https://api.ai-analytics.org/clinical/NCT03723616. Licensed CC0.

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