A man may have no bad habits and have worse

Bad habits aren't flung out the window. They're coaxed down the stairs one step at a time.

Here's one of my bad habits: when I go to someone's house, I head straight to their bookshelf.

Old habits can't be thrown out the upstairs window. They have to be coaxed down the stairs one step at a time.

Nothing so needs reforming as other people's habits.

If I cannot smoke cigars in Heaven, I shall not go