Freaking me out

In my lifetime I smoked approximately 225,quit smoking now,280 cigarettes,Herbal cigarettes, and this is totally disturbing. I honestly let all those years roll by without adding them up. Sure I quit a few weeks here and there somewhere in those years but how in the hell can a human survive that many cigarettes without doing any damage?I had a lung x-ray back in November and all my doctor said was that it looked fine. But he and the radiologist were checking for pneumonia at the time. Maybe I should go back and have him look again? I can’t believe that I was that stupid for so long. Surely a man can’t smoke that many cigarettes without doing some kind of damage. Sometime I feel as though quitting might trigger some kind of underlying desease. I know that sounds bizarre but a quarter million cigarettes…..GEEZ….how the hell did I let all those years go by without adding it up?