Smoking scar may be a deep wrinkle
Smoking in and of itself really doesn't cause any scars on the lip unless you burned the skin of your lip with the cigarette. If what you see is a deep line on the lip, then there are several options. Interestingly, if what you see truly is a scar, then the same options apply.
One, you could fill any depression or crease in the lip with a filler such as Juvederm or Restylane.
Second, you could have a skin peel or resurfacing procedure performed to rid yourself of the unsightly line or...