Tip from a nurse friend: buy those mint rubs that they use for kids at a pharmacy (here it's called Vick's Vapo Rub but any brand will work). It smells very minty and will overpower any other smell. You can put it under your nose or, for extra intensity, all over your chest and back. If bothered by anyone, this is a "drug" or device to aid respiratory problems so HR would probably side with you, even the fat ones