I was out with friends abut a year ago, and one of them burnt me on the arm with a cigarette. There is a small scar there now, it has definitely gone down since it happened, but you can still see it. It's not too noticable though, I probably just notice it more because I know it's there. Its not like a 'normal' scar, it's just a slightly different colour to the rest of my skin, and isn't raised or anything. On the other hand I have friends who have had pretty bad cigarette burns and they have no scarring what so ever!