http://www.wired.com/news/medtech/0,1286,61091,00.html
Baur grafted a tomato plant onto tobacco roots, and voilą, he had a real, live tomacco plant. The two plants can successfully become one because they come from the same plant family, which also includes eggplant and the deadly nightshade. The tomacco even bore fruit, although Baur said he believes it's poisonous because it likely contains a lethal amount of nicotine.