Research Article Cigarette dependence. I. Nature and classification. Br Med J 1971; 2 doi: https://doi.org/10.1136/bmj.2.5757.330 (Published 08 May 1971) Cite this as: Br Med J 1971;2:330 Article Related content Metrics Responses Peer review This is a PDF-only article. The first page of the PDF of this article appears below.