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Tse LA, Yu IT, Au JS, Yu KS, Kwok KP, Qiu H, Wong TW: Environmental tobacco smoke and lung cancer among Chinese nonsmoking males: might adenocarcinoma be the culprit

Do not restart: One cigarette will often start you off again at the beginning, so be sure to have a plan for when a friend offers you one

John Snow was able to draw in London in 1854 between an outbreak of cholera among the inhabitants of Golden Square, in the borough of Marylebone, and a pump, on Broad Street, from which the families of the victims had been drawing their drinking water

In this related article, I explain why: Estimating the death toll of risk factors with excess deaths Another approach to estimating the number of people who die from a causal risk factor relies on statistics of excess deaths