Don't smoke: I am not aware of any way to prevent the darkening of skin or lips when exposed to tobacco smoke. Seriously, why find a way to prevent a cosmetic effect of a drug which is the number one preventible cause of death in the us (as well as elsewhere), causing premature heart disease, stroke, cancer, emphysema, bronchitis and dozens of other serious health problems, as well as fires ;other accidents?
Answered 7/4/2016
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