Smoking is associated with earlier onset of menopause.
A dose-dependent relationship exists between the number of cigarettes
smoked and the duration of smoking. Current smoking can hasten the onset of
menopause by as much as 1.5 years. Former smokers also show evidence of
earlier menopause. There is little correlation between the onset age of
menopause and age of menarche, race, parity, or socioeconomic status.