Have you even tried running a search? I popped in cannabis immune system I got over 100,000 hits. Erowid is a good place to start with questions on any drug. ]http://www.erowid.org/plants/cannabi...is_myth5.shtml
http://www.harmreductionjournal.com/content/2/1/17 (it's down a ways in the long report)- Granny:stoned: