What you don't realize is that you miss all that because the nicotine has become associated to it. Your brain gives you a virtual nicotine effect from just putting the cigarette in your hand, without any exposure to nicotine. So your body will crave holding it and flicking the ash. (You crave $12.50 a pack.:angry

And more than just the nicotine does that. Take your pick out of about 4,000 chemical agents. Besides DNA damage which could lead to cancer, smoking permanently alters genes that affect all kinds of processes, turns them off or on, and qutting smoking doesn't seem to change them back.