1. Robinson, S. & Bugler, C. General Lifestyle Survey 2008 (UK Office for National Statistics, 2008).
2. Wald, N. & Nicolaides-Bouman, A. UK Smoking Statistics 2nd Edition (Oxford Univ. Press, 1991).
3. Centers for Disease Control and Prevention. Lung cancer trends (2009); available at
http://go.nature.com/4PdC1V
4. Cancer Research UK. CancerStats Key Facts: Lung Cancer and Smoking Statistics (2009); available at
http://go.nature.com/2BBv4T
5. Mathers, C. D. & Loncar, D. PLoS Med. 3, e442 (2006).