A novel cause of eosinophilic pneumonia: recreational marijuana exposure.

Eosinophilic pneumonia is characterized by pulmonary infiltrates visible on radiography, eosinophilic infiltration into the lung parenchyma, and frequent peripheral eosinophilia. The etiology may be idiopathic or secondary to identifiable causes, including drugs, parasites, toxins, infections, or systemic diseases such as hypereosinophilic syndrome. A 60-year-old man was seen in pulmonary clinic with 4 weeks of cough and wheeze.