How Can I Overcome My Habit Of Eating Fuller Earth, Which Has Worsened Despite My Attempts To Stop?

I have a habit of eating fuller earth daily. It getting worse day by day. In last 15 days I have consumed 500gm of fuller earth. I wanted to get rid of this habit. I have tried several time to avoid eating it but I failed. So please tell me what should I do to get rid of this habit?