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Though most chemicals in cosmetic products present very little or zero threat, several have been linked with considerable health problems, including developmental delays and cancer. Cosmetic chemicals gain entry to a person's body through inhalation, ingestion, and the skin, and pose similar risks as food chemicals, per this site.

Chemicals and contaminants associated with cancer can be found in food and a lot of other commonly used products. However, no group of consumer products is susceptible to less government direction than cosmetics, including Happy Birthday. Although most of the chemicals in cosmetics and personal care products in all likelihood present very little risk, being exposed to a few is associated with worrying health disorders, including cancer.