Hi, I found this site while researching into the habit of eating ice. I first tried eating ice when I was about 12 (now 20) when I saw my younger sister eating it and she said it was nice. So I tried it and havent stopped since. Although my sister was never addicted to it she just liked it but has since stopped eating it.
I tend to eat more if its avalible, for example I used to work in a bar with a commerical ice machine so I was eating it all day every day. But now I just eat about 3 trays a day. I dont like "big ice" and although I havent tried a lot of different styles, I tend to just fill my ice trays up a quarter of the way so they are smaller. I LOVE LOVE LOVE LOVE ice when it is not clear and is misty looking because it seems to break nicely in your mouth and doesnt hurt your teeth.
I do not know anyone who eats ice like I do and was surprised by how common it is especially in the US. Everyone who sees me eating ice thinks I am a complete odd ball, but I just say I like it.