You have no proof that I am who you think I am. Perhaps MarkM is a friend of the person you're thinking about. You don't know, you're just guessing. It's irrelevant anyway. Cussing is a sin, as St. Alphonsus clearly teaches us. The worldlings we live around may do it all the time, but Catholics shouldn't pick up the habit, or confess it if we did. Cussing is a sin. Our tongues that have so often received Our Blessed Lord in Holy Communion should be pure like the tongues of Angels and only speak of God and holy things. Not blaspheme, cuss, use vulgarities etc.