Hi! I was addicted to eating slate pencil for past 20 years but I have given up eating slate pencil for last 3 years. I have a daughter of 2 and a half. I do get cravings but I have decided not to take it anymore. I want know what harm has it done to my body. However, I can without doubt say that my teeth have badly eroded and have dental issues. Apart from this I feel no health issues.