It is bad....
Eh, I'll help you out though:
http://www.marijuana-uses.com/essays/083.html
http://www.perkel.com/politics/issues/pot.htm
http://www.keithboykin.com/arch/2003...he_truth_about
Not really what you want but they should read this:
http://www.strike-the-root.com/61/victor/victor1.html
These links aren't scientific but they do show a different aspect of marijuana use that usually isn't portrayed by the media or gov't. You won't be finding any medical study saying recreational use of marijuana is good.