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A University of Bern analysis of data from a 25-year study showed that smoking marijuana was only associated with clogged arteries in lifetime tobacco users. Scientists have long known that smoking tobacco is associated with atherosclerosisexternal link – a condition in which arteries are clogged by the build-up of fatty deposits called plaques –  especially in arteries that supply blood to the heart. But there has been scientific disagreement over the effects of marijuana.