This resource pack, turns some of the blocks/items into consumable substances..
Here are the names
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WEED
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Bread - Weed Brownie
Wheat - Bag Of Weed
Wheat Seeds - Weed Seeds
Haybale - Block Of Weed
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SHROOMS
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Carrot/Carrots - Shrooms
Carrot on a stick - Shrooms on a stick
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Also changes the achievement you get for placing your first "Weed" crop.