I AM 39 YRS OLD LADY -WHEN IWAS ACHILD USE TO EAT SLATE PENCILS ,AT THE AGE OF17 I HAD INTESTINE TUBERCULOSIS, I TOOK MEDICINE FOR 3 MONTHS BECAME OK , BUT NOW I AM MOTHER OF 3 YRS OLD CHILD, AGAIN FEEL LIKE EATING SLATE PENCILS,..WANT TO KNOW THE EFFECTS OF THIS HABIT AND HOW TO STOP IT.