Anybody knows what causes this?
And it’s just 4 out 150+ Plants 
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I see grasshopper damage, they could carry virus, could be Tobacco Mosaic Virus;
This is yours:
Other examples:
You should check if it expands around, that would be a symptom …
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that is definitely a pests, virus or a bacterial infection. I don’t think it can be cured at that point but you may try pesticide of a sort. I mean that the pesticide will probably do it’s job but will you like to smoke it after? Surely the buds will not be sprayed but still…it will be in the plant
Na, i don’t think so. Something is eating the plant.
It’s first sucking it and then eating it.
The pictures are somehow the developing of that “whatever the f it is” 
I think i’m a bit more positiv in this specific case 
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Grasshoppers munch, don’t suck:
Thrips, mites and aphids suck, but they’re not around, that’s not their damage, if a “non munched” leave shows that pattern it has to be something else …
They all are, but i agree thats not the right damage for them.
I cut this leaves and now lets see whats happening.
I sprayed some BT earlier this day as well and the get Sulfure+Insectsoap sprayed tomorrow.
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Good measures 
, sanitize your tools just in case … 
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If it started at the top and the bottom leafs are not effected, it’s most likely a trace nutrient deficiency but that could just be a ph issue and not really a lack of said nutrient.
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