RATIONALE: Drugs used in chemotherapy use 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. Drugs such as paclitaxel may make tumor cells more sensitive to radiation therapy. It is not yet known if combination chemotherapy followed by radiation therapy is more effective with or without paclitaxel in treating unresectable stage III non-small cell lung cancer.