We don't keep peppermint oil in hospitals because hamplanet smells, we keep it in hospitals because it's a micturition aid (makes patients with bladder issues have to pee) when added to the toilet water.  We use either Vicks, or put on a surgical mask to block out odors.  Sadly, they rarely even keep enough deodorant sprays, because some of them just reek of fungal infections in their folds.