Hi Vincent, The idiom is "to kick the [bad] habit. If you include (out) then the expression is no longer recognizable as the idiom "to make yourself free of " the habit.
With the expression, "kick out," the object is usually placed between the two words: "I'd love to kick those bums out!" "Kick him out!"
"Let's kick out all the freeloaders!", where the object comes after the "out," is less common.
Best wishes, - A.