1. Mortality in relation to smoking: 40 years’;Doll, R.; Peto, R.; Wheatley, K.; Gray, R.; Sutherland, I.;observations on male British doctors. BMJ,1994
2. Life expectancy in men who have never smoked and those who have smoked continously: 15 year follow up of large cohort of middle-aged British men;Phillips, A.N.; Wannamethee, G.; Walker, M.; Thomson, A.; Smith, G.D.;BMJ,1996
3. Life expectancies of cigarette smokers and nonsmokers in the United States;Rogers, R.G.; Powell Griner, E.;Soc Sci Med,1991
4. Mortality from smoking in developed countries, 1950–2000,1994
5. Smoking and loss of longevity in Canada;Basavaraj, S.;Can J Public Health,1993