I went and looked, Pete. Appears mosaic is dispersed worldwide and it attacks over 150 species, tomatoes included. The Internet kicks ass, I had to figure all that stuff out with books before.
It's a live virus, so it'd get cooked in smoke, so you'd probably be okay in your situation. Just don't butt your smokes in your planters, and don't be touching your plants.
I'm cautious, but I don't have to be biosecure to keep from making my plants sick, and I'm a full blown tobacco hog. I'm never without snuff, and it's probably a lot more dangerous by it's nature than cigars.
