You mention aromatherapy in your book. It's the use of part of the plants that give them their fragrance and protect from predators. It carries vital energy, which will raise the energy of the person using it. Originally it was used in folk practices. The receptors in your nose are very powerful, and inhaling something will get it right into your system.
Aromatherapy works two ways, by inhaling it and absorbing it.
It's very powerful. You should not use aromatherapy products directly on the skin unless they're diluted, except for two, which are lavender oil and tea tree oil. They can be applied directly to the skin undiluted. What happens when you inhale them is the odor molecules strike nerves in your nasal passages, and are transformed into nerve impulses. These travel to the parts of the brain which are directly connected to your limbic system, then it's passed on to the part of the brain that controls the pituitary gland, and hormones are released that are essential for most of the body functions.