As a yoga teacher, I love aromatherapy. My favorite way to use essential oils is to place a few drops on the top of my feet before class. That way, the warmth of my feet acts like a diffuser for the chosen scent! As I walk around the room teaching and assisting students, the aroma gradually infuses through the room in a subtle and non-offensive way.
I find this works much better than letting the oil permeate the room with a candle or essential oil diffuser. This also helps avoid any possible issues of applying oils to students directly, who may have sensitive skin and/or allergies.
But you don't have to be a yoga teacher to use and appreciate aromatherapy.