Sunscreen was invented in 1946, it looks like. Our ability to diagnose cancer has come a long, long way since then. So it would likely be difficult or impossible to answer this question, since 50 year old data about skin cancer incidence will be lower than modern level simply due to diagnostic advances.
Source? This is my point, that I think we lack evidence for that claim.
Sunscreen was invented in 1946, it looks like. Our ability to diagnose cancer has come a long, long way since then. So it would likely be difficult or impossible to answer this question, since 50 year old data about skin cancer incidence will be lower than modern level simply due to diagnostic advances.
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