Atencion primaria
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To analyse the joint role of social class and primary health care in giving up smoking. ⋯ Social class is a powerful determinant of smoking. Men in low-classed jobs are at greater risk of starting to smoke, are less likely to give up, and smoke more. The proportion of quitting seems lower in of public clinics users. Health advice is efficacious, but in population terms other factors seem to have greater influence.