Part 2 · Counting Disease
Same concept, other depth: Clinical Reasoning →
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In the 1950s, doctors noticed lung cancer was rising. Doll and Hill took patients with lung cancer and patients without it, and asked both groups about smoking. Far more lung cancer patients had smoked. This case‑control study was one of the first strong pieces of evidence that smoking causes lung cancer. It answered a huge question within months, not decades.
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