White lines on leaf veins (see pic)

Hey Growmie, Those white lines look like the trademark of leaf miners. Leaf miners are insect larvae that hatch from eggs deposited between the upper and lower surface of plant leaves. The hungry larvae munch their way around the leaf, leaving a telltale white trail or tunnel. You can use Spinosad Products or Neem Oil to fix it. The Spinosad products though are organic and completely harmless to pets, children, and plants. Hopefully, I answered your question and remember ..."Happy Growing" and "Free your mind one puff at a time".