Aside from the finding (summarized here) that marijuana smoking is not associated with lung cancer, here is a list of its effects on lung function.
This review of 34 studies published over almost 40 years was published in the Archives of Internal Medicine.
An association between short-term marijuana use and bronchodilation
No consistent association between long-term marijuana smoking and airflow obstruction measures
Long-term marijuana smoking was associated with increased respiratory symptoms, including cough, phlegm, and wheezing
Studies were variable in their overall quality, but the bottom line, according to the researchers is that “long-term marijuana smoking is associated with increased respiratory symptoms suggestive of obstructive lung disease.”
John Russo, Jr., PharmD, is president of The MedCom Resource, Inc. Previously, he was senior vice president of medical communications at www.Vicus.com, a complementary and alternative medicine website.