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Eating non-food substances (chalk, clay, dirt, crushed ice, etc.) is called "pica" and is usually considered indicative of a deeper health problem, quite often one of the various types of anemia. You should see your doctor if you crave things like this - a very simple blood test could tell if you are anemic. As for harm - unless you cause yourself to be terribly constipated, get a bowel obstruction, etc., chalk is not by itself particularly harmful as such. The problem is "chalk" can be lots of different things: natural chalk is mainly calcium/limestone, and you could probably get too much calcium from eating it. Blackboard chalk is probably a totally different thing - not toxic, but not intended for human consumption either.
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