Mullein for asthma: What are the benefits? I was looking for a natural way to ease my cough and cut down on vaping, and this mullein diffuser pen has been a game changer. The light, floral sweetness is incredibly smooth and satisfying, making Wellness Influencers Say Smoking Mullein Leaf Is a Lung Cleanse. Doctors Say There's a Much Healthier Alternative. So my daughter got me this Mullein aromatherapy inhaler thing (basically like a vape) and I really like it so far. Contains no tobacco or nicotine. Mullein is good for removing mucus