| http://www.w3.org/ns/prov#value | - In 1967, it was that the evidence ???strongly suggests??? a causal relation.41 In 1968, a causal conclusion was drawn, but only in the very weak statement that smoking ???can contribute to the development of??? coronary artery disease.42 Throughout most of the 1970s, the Surgeon General, while declaring smoking a ???cause??? of lung cancer and other cancers, was calling smoking a ???risk factor???
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