Rates of cigarette smoking among young people in the U.K. remain high and m
ay be increasing. However, few studies have explored smoking behaviour duri
ng the mid- to late teens. This paper reports the third wave of a longitudi
nal study that followed 106 15-year-olds from their last compulsory year at
school for 22 months. Using a mixture of qualitative and quantitative meth
ods, the study shows that this is a period of considerable flux in smoking
behaviour. Becoming a regular smoker is not a straightforward progressive p
rocess. The role of friendship groups and social context is highlighted. Sm
oking prevention programmes should be developed to meet the needs of young
people in this transitional period. (C) 1999 The Association for Profession
als in Services for Adolescents.