The "nice smelling ones" that are rip offs of Fischer Bee Quick (or Fischer Bee Quick) smell like benzaldehyde. Jim says it's natural oils, which would make it naturally occurring probably almond essential oil... the rest are all butyric acid or one of several forms (and possibly isomers of) butyric acid. It smells like essence of vomit. Orange peel will contain several of the constituents of Nasonov Pheromone and will be attractive to bees. I've never seen them react to cinnamon, but it keeps the ants away.