did not include enough marijuana smokers to draw that conclusion.
"Canada was a good place to do it as they are more relaxed about pot smoking, and it was likely to be easier to get cooperative subjects," Edelman said. "The most impressive finding is the synergism between tobacco and marijuana smoking."
"A modest amount of pot smoking added to cigarette smoking really knocks your lungs for a loop," Edelman added. "One wonders if this is a chemical synergism or behavioral -- those who smoke both pot and tobacco inhale each more deeply than those who smoke only tobacco."
More information
To learn more about COPD, visit the U.S. Heart, Lung, and Blood Institute.
SOURCES: Wan Tan, M.D., University of British Columbia and St. Paul's Hospital, Vancouver, British Columbia, Canada; Norman H. Edelman, M.D., scientific consultant, American Lung Association, Washington, D.C.; April 14, 2009, Canadian Medical Association Journal
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