SummaryA detailed record of the smoking habits of 83 patients treated in hospital for neurosis was compared with national statistics derived from the General Household Survey and Statistics of Smoking in the United Kingdom, and with a control group of patients admitted for treatment of varicose veins. Neurotic patients were more likely to be smokers. They started to smoke at a younger age, smoked more cigarettes and were more likely to inhale deeply. It is concluded that neurotic patients have a greater exposure to the potentially toxic effects of cigarette smoking than non-neurotic individuals.