Rosemary Oil and Concentration
Apparently aromatherapy isn’t all in (someone else’s) heads — cognitive performance went up in a study of the benefits of smelling rosemary oil during work tasks:
Plasma 1,8-cineole correlates with cognitive performance following exposure to rosemary essential oil aroma
I’ve now tried this myself, actually, and I think I do get more done in more focused bouts with a teaspoon of rosemary oil bubbling nearby. I light that candle when I’m working from home, and it’s been very pleasant and productive.