Limonene is the substance that makes lemons smell of lemon.
Limonene is a common fragrance ingredient used widely in many cosmetic and homecare products. It has been claimed that limonene is a carcinogen - this is not the case. It has not been classified as being carcinogenic either by IARC, the World Health Organisation's International Agency for Research on Cancer or by the European legalisation on carcinogenic substances. If any substance is classified as a known carcinogen then it is simply not allowed to be used as an ingredient in a cosmetic product. Limonene is perfectly safe as used in cosmetic products.
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