Why does Messages on my iPhone take up so much space?

I have a 16GB phone and Messages takes up 6.2GB. Yes. 6.2GB in usage. I currently have no messages because I always delete. Could someone help me?

Added (1). I do use iMessages

You know that if you use iMessage instead of text message when you have Wi-Fi available it's free, right?

If need be try using PhoneClean for the desktop to clear out cache. A clean restore though would clear it out for sure.

My messages take up 2 "meg"…

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