Unilever is recalling dry shampoo aerosol products sold nationwide because they may contain elevated levels of benzene, a human carcinogen.People should take the benzene-related recalls seriously, as they involve a far more dangerous contaminant than most, according to David Light, CEO of Valisure, an independent lab in New Haven, Connecticut, that alerted the Food and Drug Administration to its findings of benzene in sunscreen sprays last year."Benzene is such a bad molecule — it's at the very top of the FDA's list of 70-some solvents not to use," Light told CBS MoneyWatch, adding that unlike with some chemicals, "there's no argument about whether or not it causes cancer in human beings.""Even small amounts constitute big action," added Light, citing the global recall that ensued after benzene was found in bottles of Perrier mineral water more than three decades ago.The latest recall includes dry shampoo aerosol products made before October 2021 from brands Dove, Nexxus, Suave, TIGI (Rockaholic and Bed Head), and TRESemmé, the company said in a notice published last week by the FDA."