Smoking prevalence is reported to be increased in populations with anorexia nervosa (AN), and engagement in smoking in AN is suggested to result from attempts to control weight. However, both smoking and AN have also been linked with earlier anxiety; thus anxiety may explain the association between smoking and AN. This study will assess the prospective association between AN and subsequent smoking, across three longitudinal waves of data. Models will be adjusted for childhood worry (a symptom central to anxiety disorders), to determine whether AN explains smoking beyond the predictive effects of anxiety pathology.