16. Humphrey, Farrington & McClain, P.C. Popcorn Lung Disease Lawyer | Butter Flavoring Toxicity, Diacetyl & Bronchiolitis Obliterans Free initial consultation. Our attorneys are the leaders in handling popcorn lung disease litigation in the United States. If you believe you might be affected, contact our Independence, MO office to learn how we can help. Call toll-free, (877) 436-3692.