it's not just the variegation, that can and does happen naturally. with tmv, or faux-tmv, leaves will grow with a strong curl sideways, and if it's effecting a lot of leaves, the plant can grow slowly. the whole plant doesn't seem as healthy, and yield will suffer. most of the time, though, it doesn't seem to effect enough of the plant to make a major difference. i just clean up good afterwards, better to be paranoid than sorry