They are hard to break. If it makes you feel any better, I still occasionally reach in my pocket for a lighter when I am sitting down for breaktime at work. I laugh and move on. Its not just cigarette habits that cause absent minded reactions either. We recently, like 2 months ago, got a new entry method at work and i still find myself trying to use the old method even though its not there anymore. I was laughing about it and a coworker admitted to doing the same thing.