Yes, if you don't give up those cancer/emphysema sticks.
Just kidding. Lots of tobacco smokers grow marijuana and tobacco mosaic virus doesn't seem to be all that common. One of Poon's crops in the Grow Journals forum was ruined by it though if you want to read about how devastating it can be. Following the directions above, washing hands thoroughly with hot soapy water each time before handling your plants will reduce the risk significantly.