Gemcitabine, Carboplatin or Paclitaxel Plus Radiation Therapy in Treating Patients With Stage IIIA or IIIB Non-Small Cell Lung Cancer

RATIONALE: Drugs used in chemotherapy, such as gemcitabine, carboplatin, and paclitaxel, work in different ways to stop tumor cells from dividing so they stop growing or die. Radiation therapy uses high-energy x-rays to damage tumor cells. Combining radiation therapy with chemotherapy may kill more tumor cells. PURPOSE: Phase I trial to study the effectiveness of combining combination chemotherapy with radiation therapy in treating patients who have stage IIIA or stage IIIB non-small cell lung cancer.