I'm a seed that's underground. Many like to spread me around. What am I ?

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I’m a seed that’s underground.
Many like to spread me around.
But my family it’s said is quite insane.
And if you’ve a low I.Q. you’ve this kind of brain.
Eat me raw and I’ll make you sick.
Eat too much and your tongue will stick.

What am I?

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A Peanut