Periodically smoking marijuana doesn't appear to hurt lung capacity, the largest study ever conducted on pot smokers has found.
Even though most marijuana smokers tend to inhale deeply and hold the smoke in for as long as they can before exhaling, the lung capacity didn't deteriorate even among those who smoked a joint a day for seven years or once a week for 20 years, according to the study published Tuesday in JAMA, the journal of the American Medical Association.
http://vitals.msnbc.msn.com/_news/2012/01/10/10098412-smoking-pot-doesnt-hurt-lung-capacity-study-shows
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