Marijuana effective against cancer
http://www.salem-news.com/articles/j...ment_11008.php
Marijuana destroys cancer cells
http://cancermarijuana.com/2009/04/0...-cancer-cells/
Marijuana kills brain cancer
http://health.usnews.com/health-news...in-cancer.html
So I guess if it causes cancer, once you get it you shouldn't stop and if you haven't yet you should start.