William, the skin cancer people tend to get from the sun is Basal cell carcinoma. It is the least serious type of cancer, it grows slowly and rarely spreads. It is very easy to treat.
When you DO NOT get sun, you can get Malignant melanoma instead. It is quickly spreading and deadly.
"A U.S. Navy study found that melanoma occurred more frequently in sailors who worked indoors all the time. Those who worked outdoors had the lowest incidence of melanoma. Also, most melanomas appear on parts of the body that are seldom exposed to sunlight (Arch Environ Health 1990;45:261267). Sun exposure is associated with increased survival from melanoma (J Natl Cancer Inst 2005;97:195199). Another study showed that people who had longer lifetime exposure to the sun without burning were less likely to get melanomas than those with less exposure (J Invest Dermatol 2003;120:10871093.)
The rise in skin cancers over the last 25 years parallels the rise in use of sunscreen lotions, which block vitamin D-producing UVB radiation but not cancer-causing ultraviolet A radiation (UVA). (Newer sunscreen lotions also block out UVA.) Each year there are 8,000 deaths from melanoma and 1,500 deaths from nonmelanoma (squamous and basal cell) skin cancer. Surgical excision of nonmelanoma skin cancers cures them, except in rare cases where the growth has been allowed to linger for a long time and metastasize. Dr. John Cannell, Executive Director of the Vitamin D Council, makes this point: 1,500 deaths occur each year from non-melanoma skin cancer, but 1,500 deaths occur each day from other cancers that vitamin D in optimal doses might well prevent. (The Vitamin D Council website is an excellent source of information on vitamin D.)"
http://www.lewrockwell.com/miller/miller25.html
"New research shows higher levels of vitamin D may help improve survival for both bowel and skin cancer patients*.
The results of two studies published in the British Journal of Cancer and Journal of Clinical Oncology found people with higher levels of vitamin D - at the time they were diagnosed - were more likely to survive.
In the first study researchers from the Dana-Farber Cancer Institute, Boston followed 1017 bowel cancer patients for around nine years.
Using information about UV-B and sunlight exposure, skin type, body-mass index, and vitamin D intake from food and supplements they estimated the amount of vitamin D in patients' blood at the time of diagnosis.
The results showed that those with higher vitamin D scores after being diagnosed with cancer were 50 per cent less likely to die from the disease - compared to those with lower vitamin D score"
http://www.medicalnewstoday.com/articles/164732.php
I'll take my chances with the slow spreading cancer.