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Though most chemicals in cosmetic products pose slight or no threat, dozens are associated with significant medical problems, including cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals enter a person's body through the skin, inhalation, ingestion and internal use, and cause the same dangers as food chemicals, per this site.

Chemicals and contaminants linked to cancer can be found in food and various other commonly used goods. However, no classification of consumer goods is subject to less government management than cosmetics, including Walk On The Runway. While many of the chemicals and contaminants in cosmetics almost certainly present little risk, being exposed to a few has been linked to major health conditions, including cancer.