FRAGRANCES

While the majority of chemicals in cosmetics present limited or no risk, several dozen have been associated to significant medical issues, including cancer, reproductive and neurological harm, and developmental delays. Cosmetic chemicals enter the body through ingestion, inhalation, and internal use, and lead to the same risks as food chemicals, per this site.

Chemicals associated with cancer are found in food and several other common items. Still, no category of consumer items is susceptible to less government inspection than cosmetics, including Justin Bieber's Girlfriend Scented Tattoo. Although many of the chemicals in cosmetics and personal care products almost certainly present very little risk, exposure to some has been associated with substantial health concerns, including cancer.