When I was six or seven, I ate a box full of Pomfret cakes - pure liquorice in a handy, pocketable size (for a kid still wearing shorts and putting anything and everything in the pockets), they were meant to last a week or more.
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... I'm still not convinced it was entirely the Pomfret Cakes wot dunnit, probably something to do with coming into contact with residue of other 'stuff' that had been in my pockets.... (slugs, worms, bits of frog, sticklebacks etc.)
My mum always said you get a good run for your money with liquorice. (S. Milligan.)