don't curse

Honestly I think the thing I get asked most is "does the bible say that it is a sin to curse". Honestly I don't know But looking at this scripture it sure does tell me not to curse or use foul language. Ephesians 4:29 (New Living Translation) "Don't use foul or abusive language. Let everything you say be good and helpful, so that your words will be an encouragement to those who hear them." What do you think?