actually, mj smoke pushes pollutants to the outer lining of the lungs, and there has never been any documented case of disease due to a browning of the outer lining of the lungs... it does not contain the same compounds as tobacco (most notably nicotine) and has been shown to not only not cause cancer, but inhibit the growth of tumors

-cannabismd.org

also i did some more research after i made my last post.. to clarify, it seems that eating raw weed CAN get you high, but without heat activation of the active compounds in the bud it is grossly inefficient... so stick to making butter, vaporizing, or smoking