Study of identical twins reveals how bad habits can age skin. Identical twins Jeanne (L.) and Susan (R.) no longer look exactly alike. Susan smoked for many years and is an admitted sun worshipper, habits Jeanne does not share.

Study of identical twins reveals how bad habits can age skin. Identical twins Jeanne (L.) and Susan (R.) no longer look exactly alike. Susan smoked for many years and is an admitted sun worshipper, habits Jeanne does not share.

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