The Gemorah says Someone that talks Nivul Peh even if he has destined for him 70 good years that will be changed for the bad CHSV
It is brought down, an easy way to tell if someone is careful with himself (Vhamaivin Yovin) is in the words that he uses the word MILAH which means WORD, is the same word for MILAH ( Vhamaivin Yovin)