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The 13th World Conference on Tobacco OR Health
Building capacity for a tobacco-free world
July 12-15, 2006, Washington, DC, USA
Objective: This study was designed to compare the hazards of cigarette smoking in women who had formed the habits at different times, and the level of the reduction in risk when tobacco smoking is stopped at different points.
Methods: Prospective study that started from 1999 to 2004 in Lagos state university teaching hospital, 1850 female doctors participated. Information about their smoking habits was taken in 1999 and periodically thereafter: cause special mortality was monitored for 5 years.
Results: The excess mortality associated with smoking chiefly involved vascular, neo-plastic, and respiratory disease that can be caused by smoking. Women born in 1970 – 1980 who smoked only cigarette and continued smoking died on average about 10 years longer than life long non- smokers. Cessation at 60,50,40, or 30 years gained respectively, about 3,6,9 or 10 years of life expectancy. The excess mortality associated with tobacco smoking was less for women born for 1970 and was greatest for women born in 1980s. The cigarette smoker versus non smoker probabilities of dying in middle age of 28 – 55 were 44% v 14% a three fold death ratio) for those born in 1930s.
A substantial progressive decrease in mortality rates among non- smokers over the past half-century (due to prevention and improved treatment of disease) has wholly outnumber cigarette smokers by a progressive increase in the smoker/ non- smoker death rate due to earlier and more intensive use of cigerette