Hi there! This could look like some sort of moths are eating your leaves and sucking-out your nutrients. You may want to check carefully for bugs/moths/spiders, look everywhere under the leaves, under the pot, into your soil. If there's none, this is probably related to Tobacco Mosaic Virus, as mentioned by our friend
@DudeGrowsWeed. If it's the case, there's not much you can do but kill it quickly to prevent the virus from spreading to your other babies (this disease can be transmitted by your hands, by leaves contact, by the soil...it's a real pain in the ***). I'll be around, keep us up-to-date and good luck with your last weeks! 👊