First off, in spite of what Lip says (luv ya anyway, Lip!), get a vaporizer- they are very easy on the lungs. As to lung cancer- read this, an oldie but goodie- http://www.erowid.org/plants/cannabi...i_1_text.shtml
You might just run a search on cannabis, lung cancer, abstract. You'll get loads of articles!- Granny Storm Crow:stoned: