Also from the paper >At present, it is not possible to draw a conclusion whether nicotine itself may act as a complete carcinogen If you're going to quote it,

Also from the paper >At present, it is not possible to draw a conclusion whether nicotine itself may act as a complete carcinogen If you're going to quote it, include the bits that don't agree with you as well. The paper basically says "it may affect the role of other cancer causing agents, but we're not sure yet. We cannot say that nicotine is, in and of itself, a carcinogen" Also reach back in time 30 minutes and remember that you claimed nicotine is, by itself, a "well known carcinogen", which is false.