Cassia has a strong, spicy aroma that can be used in small quantities to transform any essential oil blend. Cassia has been used for thousands of years for its many health benefits and is noted for its unmistakable fragrance and calming aromatic properties. Cassia is a great oil to diffuse during cold months due to its warming properties and spicy scent. Due to its caustic nature, Cassia should be diluted with a carrier oil when applied to the skin and can be very strong when inhaled directly. When diluted and applied topically, Cassia can help soothe the body.