1 joint equals up to 5 cigarettes
(AP)
<p><a href="http://us.rd.yahoo.com/dailynews/rss/health/*http://news.yahoo.com/s/ap/20070801/ap_on_he_me/pot_vs_cigarettes"><img src="http://d.yimg.com/us.yimg.com/p/rids/20070731/i/ra2743072430.jpg?x=130&y=92&sig=xU.53tvctl1Pss8kG.RnmQ--" align="left" height="92" width="130" alt="A man smokes a marijuana joint at Dundas Square in Toronto April 20, 2007. REUTERS/Mark Blinch/Files" border="0" /></a>AP - A single joint of marijuana obstructs the flow of air as much as smoking up to five tobacco cigarettes, but long-term pot use does not increase the risk of developing emphysema, new research suggests.</p><br clear="all"/>

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