Apical Lung Cancer

How long does it take for lung cancer start to show symptoms?
I am a woman of 30 years, I smoked for 12 years. I was looking through my military medical records (I am on active duty), and found some reports of Radiology August 2006. I fully forgotten X-rays (I had two games). The results of the AP first said that "the density of 1.5 cm in the medial left corner. The significance of this is clear." I had another PA and a lordotic one month later. The results were "Compared with the last review.'s Shoes PA See today increased slightly the density slightly lateral to that previously seen. This could correspond to the previous observation. This is a rather weak density and can represent essentially no pathology. This not directly assessed in the apical lordotic view. "I am very worried. This was three years ago, and my doctor never mentioned it. The army is normally very good on follow-up test results. What does this mean?
I would make a repeat X-ray and see what it shows. A CT could put your mind at ease …….