FACT: Incidental sun exposure is the kind of sun exposure that you may not be aware. It builds up over the years from brief everyday activities, such as dog walking and commuting. This accumulation over time can seriously damage your skin. One in five Americans will develop skin cancer during a lifetime. In addition, an estimated 90% of skin aging is caused by the sun.
3 Robinson, JK. Sun exposure, sun protection, and vitamin D. JAMA 2005; 294:1541-43
4 4 Taylor CR, Stern RS, Leyden JJ, Gilchrest BA. Photoaging/photodamage and photoprotection. J Am Acad Dermatol 1990; 22:1-15.