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Amounts of squalene in the sebum of smokers (AS, Ctr-S) is halved compared to that present in the sebum of non smokers (Ctr) (A). In parallel with this reduction a relative increase of squalene peroxide is seen (B) (p < 0.05). Ctr, healthy non smokers; AS, acne-smokers; Ctr-S, healthy smokers.
