Should I Use Mullein Leaf to Clear Out My Lungs? Banner Health Wholesale essentail oil vape with mullein for your store Mullein (pronounced mull in) is a tall, flowering plant that grows in many parts of the U.S. and Europe that has been used in herbal medicine since ancient times. People who have been 3 Ways to Use Mullein Fresh Leaf Tea, Dry Leaf Tea and Smoking and Harvesting, Drying, and Storage The Herb Mullein Should Be In Everything You Smoke Puff Herbals