Tobacco Mosaic Virus does not come from people smoking, it is a virus that effects plants in the Solanaceae family, i.e. nightshades (tomato,pepper,mandrake,eggplant,etc.) If you have TMV (which you don't) you have to kill everything, period. But I agree with some of the above comments, those plants just look like nice older moms, put them in 5 gallons, lil veg. fert and put them under a nice big light for a few weeks and you will be stoked. Just my thoughts...
It is not restricted to tobacco and it is known that
orchid-growing smokers infested their plants with viruses sticking on
their hands after smoking.
For virus-diseases the only cure is burning your plants!