I don't know of any studies. It isn't only the sun that causes skin cancer, but the sun damages the skin and makes it more susceptible to mutations that can allow skin cancer to form. Ever since tanning became popular the incidence of melanoma has greatly increased. A few decades ago it was very rare among women because they avoided the sun. It was a sign of the upper class to be pale, an indication that they didn't have to labor in the fields. Now melanoma is becoming increasingly common in women, and in the majority of cases it is caused by too much sun exposure.
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