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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
SINGLE
Enrollment
4,190
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.
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.
Mahidol University
Bangkok, Thailand
Proportion of Participants With Smoking Abstinence at 12 Months
7-day point prevalence of abstinence measured 12 months after enrollment using self-reported abstinence and urine cotinine test results
Time frame: 12 months after enrollment
Proportion of Participants With Smoking Abstinence at 3 Months
7-day point prevalence of abstinence measured 3 months after enrollment based on self-reported abstinence and urine cotinine test results
Time frame: 3 months after enrollment
Program Acceptance
Proportion of eligible smokers who consent to participate in the main intervention
Time frame: At 0 months (at enrollment)
Proportion of Participants With Smoking Abstinence at 6 Months
7-day point prevalence of abstinence measured 6 months after enrollment based on self-reported abstinence and urine cotinine test results
Time frame: 6 months after enrollment
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Each participant will receive a monetary bonus from the study investigators if he or she quit smoking, as verified by a urine cotinine test.
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.
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.
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.