UC Davis physician researchers have found that medical marijuana contains multiple bacterial and fungal pathogens that may cause serious and even fatal infections. They warn that smoking, vaping or inhaling aerosolized marijuana could pose a grave risk to patients, especially those with leukemia, lymphoma, AIDS or conditions requiring immune-suppressing therapies.
 
“Infection with the pathogens we found in medical marijuana could lead to serious illness and even death,” said Joseph Tuscano, a professor of internal medicine in the Division of Hematology and Oncology at UC Davis, and a lead study author. “Inhaling marijuana in any form provides a direct portal of entry deep into the lungs where infection can easily take hold.”