There is a beekeeper on the Illinois/Wisconsin border that swears by
using Hall's Cherry Menthol cough drops.  He puts about three or four in
each hive every time he opens them up.  He has tried a variety of
different types and, based on his observations, believes that the bees
like the cherry menthol the best.  He cautions using other types of
medicated cough drops that may have an adverse effect on the bees.  His
stories are usually good for a grin or two.