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While the majority of chemicals in cosmetics pose slight or no threat, several dozen have been associated with serious medical issues, including developmental delays and cancer. Cosmetic chemicals can enter a person's body through the skin, inhalation, ingestion and internal use, and lead to similar dangers as food chemicals, per this site.

Contaminants and chemicals associated with cancer are found in water, food, and a lot of other common items. Still, no category of consumer items is susceptible to less government inspection than cosmetics and other personal care products, including Tunnel Of Love. Though many of the chemicals in cosmetics most likely present very little risk, subjection to some has been associated with worrying health problems, including cancer.