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While many chemicals in cosmetics present limited or zero danger, some are associated with significant medical problems, including cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals enter a person's body through inhalation, ingestion, and the skin, and pose similar risks as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in food, water, and various other common items. But, no classification of consumer items is subject to less government management than cosmetics, including Carnaval Hangover. Though most of the contaminants and chemicals in cosmetics almost certainly pose little risk, being exposed to a few is associated with substantial health conditions, including cancer.