Donald P. Tashkin, MD, Professor of Pulmonary Care at the University of California, Los Angeles (UCLA), stated in a June 2005 article published in the Monaldi Archives for Chest Disease:

“The smoke of marijuana, like that of tobacco, consists of a toxic mixture of gases and particulates, many of which are known to be harmful to the lung…. Whereas THC [primary active ingredient in marijuana] causes modest short-term bronchodilation [expansion of the air passages], regular marijuana smoking produces a number of long-term pulmonary consequences, including chronic cough and sputum, [and] histopathologic evidence of widespread airway inflammation.”

June 2005