Employees from 61 worksites were matched in terms of size and type, and the
n randomly assigned to one of three conditions that received: (a) self-help
manuals, (b) self-help manuals and incentives, or (c) self-help manuals, i
ncentives, and social support groups. The intervention incorporating manual
s, incentives, and groups significantly enhanced perceived control over str
essors across all time points, and perceived control facilitated successful
quitting. Participants who were able to quit smoking perceived less stress
in their lives and were able to decrease their initial stress levels. Succ
essful quitters also used less emotion-focused coping than participants who
were not able to quit, and their increase in problem-focused coping facili
tated quitting.