To donate a kidney does not seem to constitute any long-term risk. The better survival among donors is probably due to the fact that only healthy persons are accepted for living kidney donation.
Background. Sunlight exposure and fair skin are major determinants of human vitamin D production, but they are also risk factors for cutaneous malignant melanoma (MM). There is epidemiological evidence that all-cause mortality is related to low vitamin D levels.
This study has not shown any excess risk among users of snuff for IHD or stroke. If there is a risk associated with snuff it is evidently much lower than those associated with smoking.
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