It depends on where I am. At home I'll swear to the point of being told to be quiet, whether it be swearing at games, swearing in arguments or just swearing in everyday situations/conversations (I don't swear as much in everyday conversations though). Out in the general public, I'll still swear, but I say it under my breath or out of earshot of others.
Not even sure where I picked up the habit, siblings rarely swear at home and my mother only swears when she's mad.