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Completed

NCT Number: NCT02421224

Social and Monetary Incentives for Smoking Cessation at Large Employers

The investigators will conduct a cluster randomized controlled trial of several behavioral interventions for smoking cessation among a sample of employees at large workplaces in the Bangkok metropolitan area. The study aims to test the impacts of different incentive structures for smoking cessation on take-up, effectiveness, and cost-effectiveness. The interventions are designed to elucidate certain principles from the field of behavioral economics.

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Key information

Conditions

Tobacco Use Disorder Behavior Chemically-Induced Disorders Health Behavior Mental Disorders Smoking Smoking Cessation Substance-Related Disorders

Age range

18 year and older

Sex eligibility

All sexes

Study type

Interventional

Phase

Not applicable

Primary location

Mahidol University

Bangkok, Thailand

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

  • Current full-time employee of a participating company
  • Smoker of 100+ cigarettes during lifetime
  • Smoker of 10+ cigarettes per week
  • Individual is aged 18+ years old
  • Smoker wants to quit within the next 6 months

Exclusion criteria

  • Expects to leave company within the next 12 months
  • Is currently pregnant
  • Are unable to provide informed consent

Treatment and study plan

Usual Care

Behavioral

Participants will receive in-person group counseling from a trained smoking cessation counselor. Participants will learn about reasons to quit smoking, strategies for quitting smoking, and additional resources available to support the quit attempt. Participants will also complete a quit plan.

Deposits

Behavioral

Participants will have to deposit a certain amount of their own money at enrollment. Participants will be able to make additional voluntary deposits above the minimum amount during the intervention period. The participant will be refunded all deposits if he quits smoking at 3 months, as verified by a urine cotinine test. The participant will forfeit all deposits if he continues to smoke at 3 months, as verified by a urine cotinine test.

Small Individual Bonus

Behavioral

Each participant will receive a monetary bonus from the study investigators if he or she quit smoking, as verified by a urine cotinine test.

Large Individual Bonus

Behavioral

Each participant will receive a monetary bonus from the study investigators if he or she quit smoking, as verified by a urine cotinine test. The bonus is twice the value of that in the Small Individual Bonus group.

Teammate

Behavioral

Each participant will be randomly assigned one teammate to provide social support during the quit attempt. Each participant will be assigned to a participating coworker who speaks the same primary language and works the same work shift as the participant.

Team Bonus

Behavioral

If the participant and assigned teammate both quit smoking at 3 months, as verified by a urine cotinine test, then each will receive a monetary bonus. The team bonus is equal in value to that in the Large Individual Bonus group.

Primary outcomes

  1. Proportion of Participants With Smoking Abstinence at 12 Months

    Time frame: 12 months after enrollment

    7-day point prevalence of abstinence measured 12 months after enrollment using self-reported abstinence and urine cotinine test results

Secondary outcomes

  1. Proportion of Participants With Smoking Abstinence at 3 Months

    Time frame: 3 months after enrollment

    7-day point prevalence of abstinence measured 3 months after enrollment based on self-reported abstinence and urine cotinine test results

  2. Program Acceptance

    Time frame: At 0 months (at enrollment)

    Proportion of eligible smokers who consent to participate in the main intervention

  3. Proportion of Participants With Smoking Abstinence at 6 Months

    Time frame: 6 months after enrollment

    7-day point prevalence of abstinence measured 6 months after enrollment based on self-reported abstinence and urine cotinine test results

Sponsors and collaborators

Lead sponsor

University of California, Berkeley

Other

Collaborators

  • Mahidol University
  • National Institute on Drug Abuse (NIDA)
  • National Institutes of Health (NIH)

Registry information

Acronym: SMILE

Important dates

Study start
2015
Primary completion
2017
Study completion
2017
First posted
Apr 20, 2015
Registry last updated
Dec 30, 2020

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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