Go do a little reading up on it pretty interesting. If curious. How the tobacco gets it and things like that.
IMHE, I've had that 3 times, I freaked out on the first time and read/bought whatever books i could purchase about horticulture & viruses.
A few things were clear after that, variegated growth can be a phenotypic expression, broad mites can cause the same thing, problems with copper/boron if i remember can also cause similar symptoms.
Plenty of people have had the same exact issue and the ones who actually sent in tissue samples came back negative for TMV and/or have found broad/russets, i remember reading all those threads too so it shouldn't be to hard for you to find.
Growweedeasy is a nice page for newer growers who like to brush through things but sometimes they (and others) aren't 100% accurate, of course they provide no lab testing and saying the ability to leach nutrients (flush) back out of your flower is a red flag.