Any scent would be better than gas or suntan lotion on your hands,I would think .but don't no who came up with coffee scent,maybe we should try bud light, I do belive they would hold onto that longer than the norm!!
A few guys from berkley were testing new scents and threw a handful of coffee grounds in the water, they instantly attracted bait fish, they repeated it a few times over and achieved the same results, they took it back to the lab and the rest is history.
Coffee=bait fish, baitfish=BASS