Frankincense oil is very effective as a sedative because it induces a feeling of mental peace, relaxation, satisfaction, and spirituality. It also awakens insight, makes you more introspective and lowers anxiety, anger, and stress. When feeling anxious or if you anticipate some sort of stressful episode, add some frankincense oil to a diffuser or a vaporizer. Frankincense essential oil promotes deep breathing and relaxation, which can open your breathing passages and reduce blood pressure, moving your mental state back to calmness.