It happens I think curse words (I don't like it), but I don't say it aloud. How about you?
Sometimes I say things like "dang". But that's not really a curse word, is it?
I'll make this really simple.
A rose by any other name would smell as sweet. ----Shakespeare
Ergo, substitute any curse word with another word and it is still the same curse word.
It has nothing at all to do with the word in and of itself, it has everything to to do with the heart within you and the sense of anger you might at the moment feel and express, therefore there is only one way to stop cursing and that is to Repent of it.
Repenting is not a feeling sorry for what you have done, it isn't a confessing of it, nor is it anything else you may want to define Repentance of.
Repentance of cursing is the ceasing of said cursing completely, this secession of cursing is the only way one is able to cease cursing, any substituting of words is only a way of tricking ourselves that we really don't curse, it a lie of the heart, something we do in order to feel better about ourselves without ever having to confront the curse words we might use or cease from our anger.
Jas 3:8 But the tongue can no man tame; it is an unruly evil, full of deadly poison.
Jas 3:9 Therewith bless we God, even the Father; and therewith curse we men, which are made after the similitude of God.
Jas 3:10 Out of the same mouth proceedeth blessing and cursing. My brethren, these things ought not so to be.
Jas 3:11 Doth a fountain send forth at the same place sweet water and bitter?
Jas 3:12 Can the fig tree, my brethren, bear olive berries? either a vine, figs? so can no fountain both yield salt water and fresh.
Gal_5:9 A little leaven leaveneth the whole lump.
Therefore even if you allow that which is not technically a curse word, it is a little leaven in your Spiritual life.
Heb_12:1 Wherefore seeing we also are compassed about with so great a cloud of witnesses, let us lay aside every weight, and the sin which doth so easily beset us, and let us run with patience the race that is set before us,