I am a 23 year old male, who weighs 195 lbs and I am 5.10 feet tall. All of my fingers are clubbed. My nails have become wide and thick giving them an abnormal round appearance. The skin above my cuticles is slightly raised and red. My nails do not extend straight out, but they curve down. I am almost certain that my nails are clubbed, and I am extremely concerned because there is no denying there is something is wrong with me. My nails used to be straight with a normal skin around it. Now my nails are abnormally round and extremely wide. I have all the physical symptoms of clubbing. I smoke a pack of cigarette a day for approximately eight years. I do not experience shortness of breath, except at times when doing physical activities. I am in great shape and work out six days a week. I have read articles on clubbing, and the possible causes are very alarming. Is it too late to reverse the clubbing? Is it possible that it is from smoking, and if not what can it be? I am attaching a photo of my fingers.