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2. Study of the Aetiology of Carcinoma of the Lung
3. The Mortality of Doctors in Relation to Their Smoking Habits
4. The Spectator. 70 m.p.h. http://archive.spectator.co.uk/article/3rd-december-1965/11/70-mph
5. International Smoking Statistics. 17 March 2016. A collection of worldwide historical data. http://www.pnlee.co.uk/Downloads/ISS/ISS-UnitedKingdom_160317.pdf