Unexpectedly Concluded That Smoking Marijuana

http://www.washingtonpost.com/wp-dyn/con ...

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Quote * The largest study of its kind has unexpectedly concluded that smoking marijuana, even regularly and heavily, does not lead to lung cancer. *

Because many people mix it with tobacco

Because it was a single report five years ago. . Studies have been made since that time that cancer risk related to marijuana. . Research and studies are not limited to one year or a study. . the study that you point was echoed by the media, but if you're really interested in this type of research go to PubMed.