Grass hoppers eat from the edge inwards, your damage has holes starting in the middle of the leaf, I would suggest its slug or snail or caterpillar.
Grasshoppers
Generally harmless to cannabis unless they are found in large numbers.
Slugs and Snails
These pests are molluscs of the class Gastropoda and characteristically have a flattened ventral bottom that they use for movement.They eat the leaves and stem and will kill cannabis seedlings. Slugs and snails are best hand picked from your grow area. Another way to remove them is to make a circle of table salt about four feet away from the base of your plants. Then make another circle a foot in from that. Salt is deadly to snails and slugs and will keep them out. Slugs and snails can also be repelled or killed by using slug and snail pest pellets.
Cutworms, Caterpillars and Larvae
Insects that are in their early stages of development are problem pests because they are insatiable and will eat anything green that they can get their tiny mouths around.Their appetite is surreal when you actually discover how much a caterpillar can consume in a single day. One caterpillar can reduce an ounce cola to stem and stalk in less than four days. These pests pose a huge threat to your crop and must be stopped right away. Caterpillars especially like to eat young seedlings and new growth. They are also known to leave holes in leaf as well as edge damage.
The only sure way to get rid of cutworms, caterpillar and larvae is to use a cutworm, caterpillar or larvae repellent. Usually the same product will affect all three pests. Cutworms can also be hand picked from your grow. At night they sleep in a XC' shape in the soil or under the cover of something else like a piece of wood.
What are your plants sitting on in your pictures!
plz help me!!! this is my first outdoor grow and im still learnin(this is my 2nd grow). 
