This paper reports an investigation on the educational impact of warning labels on cigarette packages on adolescents. Subjects were asked to identify the locations of warning labels on cigarette packages and advertising and to restate the warning label. Results indicated that official warnings may be well known in general terms but poorly known in specific terms. It is suggested that if mass public warning statements about health are educational devices, they should be developed and pretested with care and evaluated before they are widely disseminated. (JD)