There was, as far as I know, no observed evidence of a causal link between smoking and lung cancer.
The correlation (specifically, the relative risk ratio) was roughly 19,000% (~190x).
There have been some “natural experiments” that suggest a causal link since, but I don’t think there were any available at that time.
There was, as far as I know, no observed evidence of a causal link between smoking and lung cancer.
The correlation (specifically, the relative risk ratio) was roughly 19,000% (~190x).
There have been some “natural experiments” that suggest a causal link since, but I don’t think there were any available at that time.