Each pen  works for 300.Puffs. contains Mullein Leaf, Thyme & Mint. Do Not Inhale. Instead use retro nasal approach. The retro-nasal approach entails a gentle breath into the mouth, holding the mist briefly, and then exhaling through the nose. This route, which does not involve the lungs, effectively traps aromatic molecules in a “curtain” at the back of the throat, stimulating the olfactory receptors without taxing the respiratory system. Not only does this method magnify the aromatic experience by minimizing sensory adaptation, but it also allows the holistic benefits of our carefully crafted essential oil blends to permeate your senses in a pure and efficient manner.