[url]http://webcenter.health.webmd.netscape.com/content/article/100/105717.htm?DEST=WebMD_contentSRC_nsmain[/url]
check the bottom of the article:
Light marijuana users smoked two to 15 joints per week, moderate users smoked 17 to 70 joints per week, and heavy users smoked 78 to 350 joints per week.
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