Harm Reduction for Tobacco Smoking With Support of Tobacco-Replacing Electronic Nicotine Delivery Systems

Not Applicable

• Conditions: Smoking, Tobacco
• Interventions: Other: Standard Care (SC); Other: HaRTS-TRENDS

• Registration Number: NCT03962660
• Lead Sponsor: University of Washington

Brief Summary

This study will evaluate the effectiveness of HaRTS-TRENDS compared to standard care (i.e., brief advice to quit + referral to state quit line that offers free NRT) in facilitating a biochemically verified nonsmoking and b) reducing smoking-related harm as measured by concentration of urinary tobacco-specific nitrosamines (TSNAs). Potential underlying mechanisms of changes in the proposed outcomes--including nicotine craving and smoking reduction, respectively--will be tested.

Detailed Description

The prevalence of smoking and smoking-related illness is disproportionately higher among people experiencing chronic homelessness than among people in the general population. Unfortunately, smoking cessation treatment does not reach or engage the overwhelming majority of smokers experiencing chronic homelessness, and smoking-related harm persists even after people are housed. There have therefore been calls for more flexible and client-centered approaches tailored to this population's needs. In response, we are proposing a randomized controlled trial (RCT) of Harm-Reduction for Tobacco Smoking with support of Tobacco-Replacing Electronic Nicotine Delivery Systems (HaRTS-TRENDS) as an innovative, empirically informed, and client-driven alternative to traditional smoking cessation treatment. To maximize its efficacy, the 4-session, individual HaRTS-TRENDS was collaboratively designed with a community advisory board made up of researchers, people with lived experience of chronic homelessness and smoking, and staff and management at a nonprofit, community-based housing agency. HaRTS-TRENDS entails the provision of electronic nicotine delivery systems (ENDS) in conjunction with harm-reduction counseling. Interventionists embody a compassionate, advocacy-oriented "heart-set" or style and deliver manualized components that include a) participant-led tracking of preferred smoking outcomes, b) elicitation of participants' harm-reduction goals and their progress toward achieving them, c) discussion of the relative risks of various nicotine delivery systems, and d) instruction in using ENDS. The proposed study will feature a randomized controlled trial (N=94) of HaRTS-TRENDS among smokers with lived experience of chronic homelessness who have moved into permanent, supportive housing. Participants will be randomized to receive HaRTS-TRENDS or standard care. The standard care, which is what people most commonly receive from providers, is brief advice to quit plus referral to the Washington State quitline where participants have access to free NRT. All participants will be assessed at baseline and posttest as well as at 1-, 3-, 6-, and 12-month follow-ups. Analyses will be conducted to test the efficacy of HaRTS-TRENDS compared to SC in a) facilitating biochemically verified nonsmoking and b) reducing smoking-related harm as measured by concentration of urinary tobacco-specific nitrosamines (TSNAs). It is hypothesized that, compared to SC participants, HaRTS-TRENDS participants will show a significantly greater likelihood of nonsmoking and reduced concentration of TSNAs. Further, we will examine reductions in smoking craving as a mediator of the HaRTS-TRENDS effect on nonsmoking as well as nonsmoking as a mediator of the HaRTS-TRENDS effect on TSNA concentration. If its results are positive, this project will lay the groundwork for longer-term objectives including dissemination of HaRTS-TRENDS to researchers, clinicians, and community-based agencies to decrease smoking-related harm for a high-cost and severely affected population.

Study Timeline

• Status Verified: 2019-05
• Study Start: 2019-05-09
• Study First Submitted: 2019-05-17
• Study First Submitted QC: 2019-05-22
• Last Update Submitted: 2019-05-22
• Study First Posted: 2019-05-24
• Last Update Posted: 2019-05-24
• Primary Completion: 2021-04-30
• Study Completion: 2021-12-31

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 94

Inclusion Criteria

• Having a history of chronic homelessness according to the widely accepted federal definition,
• Being a current DESC client living in one of DESC's participating permanent supportive housing projects,
• Being between 21-65 years of age,
• Being a daily smoker (>4 cigarettes/day in the past year with a breath CO ≥ 6 ppm or salivary cotinine test at level 1 if CO < 6 ppm)
• Having adequate English language skills to understand verbal information and communicate in the study

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Exclusion Criteria

• Use of other tobacco products besides cigarettes ≥ 9 days in the past month
• Refusal or inability to consent to participation in research
• Constituting a risk to the safety and security of other clients or staff.

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Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
Standard Care (SC)	Standard Care (SC)	See description below.
HaRTS-TRENDS	HaRTS-TRENDS	See description below.

Primary Outcome Measures

Name	Time	Method
TSNA Concentration	Change across the 12-month follow-up	This primary outcome entails urinary concentration of a tobacco-specific nitrosamine (i.e., NNK), a key carcinogen in tobacco. Secondarily, TSNA concentration will be used as a longer-term biochemical index of tobacco use.
Nonsmoking	Change across the 12-month follow-up	Biologically verified nonsmoking (i.e., self-reported nonsmoking if corresponding CO measure is \< 8) in the past 7 days will serve as a primary outcome as well as a potential mediator of the HaRTS-TRENDS effect on TSNA concentration.

Secondary Outcome Measures

Name	Time	Method
CO level	Change across the 12-month follow-up	Carbon monoxide in exhaled air will be examined secondarily as a continuous measure of reduced smoking-related harm. It will also be used to biochemically verify the 7-day nonsmoking primary outcome.
smoking intensity	Change across the 12-month follow-up	Self-reported smoking intensity is the mean number of cigarettes participants report smoking per day in the 7 days prior to the assessment.
EQ-5D-5L	Change across the 12-month follow-up	This self-report measure yields 5 dimensions: mobility, self-care, usual activities, pain/discomfort, and anxiety/depression. Additionally, the EuroQoL-Visual Analog Scale (EQ-VAS) is a single item representing health-related quality of life via participants' general assessments of their current health, where 0 = the worst health imaginable and 100 = the best health imaginable.
smoking frequency	Change across the 12-month follow-up	Self-reported smoking frequency is the number of days participants report smoking in the 7 days prior to the assessment.
cotinine levels	Change across the 12-month follow-up	Urinary cotinine will reflect participants' recent nicotine use.
FEV1%	Change across the 12-month follow-up	FEV1% is the ratio of predicted lung capacity based on participants' height, age and gender with participants' forced expiratory volume in the first second of expiration as a percentage of the predicted value.
Clinical COPD questionnaire	Change across the 12-month follow-up	The 10-item Clinical COPD Questionnaire will be used to calculate an overall summary score representing respiratory HR-QoL over 3 domains: respiratory symptoms (e.g., shortness of breath), functional state (e.g., ability to climb stairs), and mental state (i.e., concern about getting a cold or breathing getting worse). The total score is calculated by summing the scores of the individual items and dividing by 10 (the number of individual items) giving a total score between 0 and 6 with higher scores representing worse HRQoL.

Trial Locations

Locations (1)

University of Washington - Harborview Medical Center; 🇺🇸 Seattle, Washington, United States