This study evaluated the impact of a year-long incentives-based worksi
te smoking-cessation program. Nineteen moderate-sized worksites, emplo
ying a total of approximately 1100 smokers, were randomized to Incenti
ve or No Incentive conditions. All identified smokers in the worksite
were considered as subjects, whether or not they participated in the i
ntervention. Analyses were conducted at both the worksite and individu
al level, and using both self-reported and biochemically validated ces
sation as endpoints. The incentive program did not significantly impro
ve cessation rates at either the 1-year or 2-year follow-up assessment
s. We conclude that more broadly focused interventions that also addre
ss worksite smoking policies, skills training, and cessation resources
, or programs that target additional risk factors are needed to substa
ntially enhance quit rates.