Study objective: Cigarette smoking is a major preventable cause of mor
bidity and mortality worldwide, Most adult smokers start smoking regul
arly some time before 18 years of age. The aim of this study was to de
termine the age at which children begin cigarette smoking, to study ti
le environmental factors that influence children to smoke, and to unde
rstand the reasons why children smoke, The results of this study may h
elp lead to the development of more effective smoking prevention progr
ams. Methods: We carried out a cross-sectional survey of all students
in grades 6 to 11 (ages: 11 to 17 years) in two high schools in the Je
rusalem area, using an anonymous self-completion questionnaire, The st
udents were asked questions regarding the age at which they began smok
ing, initiation, their smoking habits, their reasons for smoking, and
their views on children who smoke, In addition, they were asked about
the smoking status of their parents, siblings, and friends. Finally th
ey were asked about the health hazards of smoking. Results: Of the 847
students who answered the questionnaire, 35% stated that they had smo
ked at least once and 14% stated that they were currently smoking. The
percentage of students who were currently smoking increased gradually
with age to 36%. There was a sharp increase in experimental smoking a
fter seventh grade (ages 12 to 13 years). Having a friend who smoked s
ubstantially increased the likelihood of smoking, whereas parental smo
king or having a sibling who smoked did not increase the likelihood of
smoking. The most common reason for starting to smoke was ''to try so
mething new'' (55%). There was a significant difference between the vi
ews of students with different smoking statuses regarding children who
smoke: nonsmoking children associated more negative characteristics t
o smoking, All of the children studied were well aware of the health h
azards of cigarette smoking. Conclusions: Smoking is highly prevalent
among schoolchildren in Jerusalem, The increase in the rate of smoking
at the age of 12 years indicates that smoking prevention programs nee
d to be started at an earlier age. Peer pressure is a very strong stim
ulus for smoking in children. Since children are aware of the health h
azards of smoking, prevention policy should be aimed more at associati
ng smoking with negative images and addressing peer pressure.