Con
“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