I cannot say exactly how the fragrance is incorporated but my guess is the fragrant oil is blended in to the coverstock (the outer shell). It is intended to be used as "aroma therapy". If you look at many bowlers the ball is not too far from the nose and lane oil/conditioners are not so nice to smell. The scent is pleasant and calming, depending on ones taste so if you do not like cherry then it may not be so pleasant.
My Storm Fast Pearl was Cherry and very tasty indeed and the scent lasted approximately 1 year but I would think that depended on how the ball was maintained. A ball not cleaned at all will soak up alot of the oil which would affect the fragrance, and one cleaned regularly might last longer.
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