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This is based on the assumption that tobacco smoking is overwhelmingly the most important cause of lung cancer, and that the incidence of this disease in the absence of smoking would be more or less the same in all populations, so that contemporary incidence (or mortality) rates from lung cancer simply reflect the cumulative exposure of a particular population to tobacco smoking

Its not that easy, though

Defective e-cigarette batteries have caused a number of fires and explosions, some of which resulted in serious injuries

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