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Huh. A google search turns up that the cashew nut shell is extremely poisonous, and will contaminate the cashew when the shell is removed, so the raw cashew is also poisonous, but roasting it breaks down the poison.
The cashew fruit is not poisonous, but when eating the fruit, if you accidentally brush your cheek up against the cashew part, you get a rash and blisters on your cheek.
So it's a little complicated.
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