Objective: To evaluate the effectiveness of an antismoking campaign co
nducted by the Health Education Board for Scotland. Design: Descriptiv
e survey of adult callers to a telephone helpline (Smokeline) for stop
ping smoking; panel study of a random sample of adult callers; assessm
ent of changes in prevalence of smoking in Scotland before and after i
ntroduction of the helpline Setting: Telephone helpline. Subjects: Cal
lers to Smokeline over the initial one year period. Detailed informati
on was collected on a 10% sample (n = 8541). A cohort of adult smokers
who called Smokeline (total n = 848) was followed up by telephone int
erview three weeks, six months, and one year after the initial call. M
ain outcome measures: Numbers of adult smokers calling helpline; chang
es in smoking behaviour, especially stopping smoking among cohort memb
ers; and changes in prevalence of smoking in the general population. R
esults: An estimated 82 782 regular adult smokers made genuine contact
with Smokeline over the year, representing about 5.9% of all adult sm
okers in Scotland. At one year 143 of the cohort of 848 callers (23.6%
; 95% confidence interval 20.2% to 27.0%) reported that they had stopp
ed smoking, and 534 (88.0%; 85.4% to 90.6%) reported having made some
change, About 19 500 (16 700 to 22 350) adult smokers, equivalent to 1
.4% (1.2% to 1.6%) of the mean adult smoking population, stopped smoki
ng with direct help from Smokeline. During the second year of the camp
aign (1994) smoking prevalence among 25-65 year olds in Scotland was 6
% (2.0% to 10.0%) lower than it had been before the start of the Campa
ign. Conclusion: The Health Education Board for Scotland's antismoking
campaign reached a high number of adult smokers, was associated with
a highly acceptable quit rate among adults given direct help through S
mokeline, and contributed considerably to an accelerated decline in sm
oking prevalence in Scotland.